There is no need to use "empty" anymore, it was a temporary hack for Alberto to test things out without doing changes to the XML files. So just delete it.

Additionally, upgrade to K2 v2.10.3 (dev) again as new changes have been merged since the copy you installed (cause the SEO settings order had changed and I can see you still use an older version).

As for why the template of the homepage is displayed everywhere when you assign it to all K2 categories, this is normal. It's because every K2 content on the homepage "carries" the itemid of the home menu item. As such, Joomla considers that you're still on the homepage, even though you navigate to different content.

But rest assured, I'm already working on a way to have a clean URL path, without duplicate entries. E.g. if you currently create a menu item called "blog" pointing to a single K2 category also called "blog", then the path to items will be /blog/blog/whatever, which is normal cause it's essentially /menu-item-alias/category-alias/item-alias.

As for the items with /component/k2, I'm guessing these come from a 3rd party module and not e.g. K2 Content (mod_k2_content). That module does not properly parse K2 URLs from "JRoute" AND "K2HelperRoute" (see for example: github.com/getk2/k2/blob/master/modules/mod_k2_content/helper.php#L286). Just inform its developers to update their code.

Replying...

1) It depends. We operate some very large J1.5 sites for many years now without an issue because we can control everything from the server setup all the way up to the actual content (with K2).

2) Sure, but the choice for no b/c upgrade path was bad. Thus why K2 still supports J1.5 all the way up to 3.x.

3) Not really. K2 has supported 3 versions already. Adding a fourth won't be an issue when the time comes.

4) That's a known limitation. Those who know what they're doing can still operate a secure server with PHP 5.6.

In fact with the latest K2 it has been easily shown that any extension can be backwards compatible (some still are) and look great at the same time. Plus, people who want to move their content to a newer Joomla release will have an easier upgrade path if they switch to K2 because unlike com_content, K2 shares the same DB structure across all Joomla versions. Which was not magic either way, just common sense.

What "additional" categories? If you refer to the extension, it's outdated. You can upgrade to this one www.web357.com/product/multiple-categories-for-k2-joomla-plugin which actually works and does not require hacking K2.

You're probably using a very old MySQL version (before 5.5.3). You need to contact your hosting provider and request an upgrade to the latest sub-version in 5.5.

If this is not possible, do the following:
- Download K2 from its GitHub repo: github.com/getk2/k2/archive/master.zip
- Extract that zip file. It will create a "k2-master" folder and in that folder edit the file administrator/components/com_k2/install.mysql.sql replacing all "utf8mb4" instances with "utf8".
- Re-zip the CONTENTS of the "k2-master" folder and upload to your site for installation.

Hello!
I have installed Joomla with latest version and K2 v2.9.0. When I try to update K2 to v2.10.2, I receive an error: Unknown character set: 'utf8mb4'.
Default charset of MySQL server ir UTF8, DB default charset is UTF8, also tables default charset is utf8.
What is the problem?

It's been fixed in K2 v2.10.3 (dev) and you can safely upgrade to it using: github.com/getk2/k2/archive/master.zip

Sorry for this, I missed it for v2.10.2.

I have added the required CSS to resolve this issue (demo: jmp.sh/WNHGB7t) and you can use it now if you install K2 v2.10.3 (dev) from: github.com/getk2/k2/archive/master.zip (it's perfectly safe to upgrade as any changes merged already resolve such minor UI inconsistencies).

Thank you, Fotis!

The trouble was related to "Additional Categories for K2." Apparently it's not compatible with K2 2.10.x. In my testing, at some point I created a new item and assigned it to a category that appeared blank (front end listing) after upgrading to K2 2.10.x. The new/test item appeared in the front end listing. Filtering items by category in the back end, I realized items that had been assigned a secondary/additional category no longer appeared in secondary/additional categories.
As you recommended, I purchased a "multiple categories" pro subscription. The extension is working well.

The category feeds are indeed broken up to v2.10.2. So you need to grab v2.10.3 (dev) from github.com/getk2/k2/archive/master.zip in which I fixed that issue today. It's 100% safe to upgrade to it.

As for the warnings you get, these come from your template overrides for K2 and they need to be slightly updated to work with PHP 7.2+.

In the example you mention, change:
to:
This should do the trick. Make sure you update all "count(...)" references in your K2 template overrides like so.

Completely uninstall "Additional Categories for K2". It's old, deprecated, requires hacking K2 and not supported anymore. Instead go for www.web357.com/product/multiple-categories-for-k2-joomla-plugin which is far better and actively supported.

Make sure you uninstall everything from "Additional Categories for K2", especially any plugins as these may cause the problem you have.

Your page is currently inaccessible.

Just make sure your template overrides are updated wherever you have a "count(...)" reference. Just compare it to the source K2 template files, it's not difficult.

Hello,
I have the following problems adding articles after the upgrade:

- the menu on the left overlaps with the editing window
- the "close" button doesn't work


Is it possible to return to the previous menu appearance in backned?

Hi Fotis,

Thank you for responding!
I had already set error_reporting to maximum and debug enabled (1). I have the third-party extension, Additional Categories for K2, which results in "Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP..." when enabled. That's the only warning/error that appears. Before starting this topic, I had already disabled that extension (component + plugin) with no apparent effect (other than no more warning/error). The K2 category pages still appeared blank (except for K2 category title).
After you replied, I tried disabling many/most third-party extensions (components, modules, plugins) for testing/troubleshooting. Unfortunately this made no difference. I'm not sure what else to try...

Hi. Since I upgraded K2 to 2.10.x I am getting this error when creating / saving CATEGORY. I know this has to do with Simple Image Gallery (3.6.6 version). I did debugging and it led me to line 67 in \plugins\k2\jw_sigpro\jw_sigpro.php:
$item->store();
Further, I see K2 v2.10.x has category model now and that's different than K2 v2.9.x. Now we have call in \administrator\components\com_k2\models\category.php, line 138:
// Trigger K2 plugins
$dispatcher->trigger('onAfterK2Save', array(&$row, $isNew));

All in all, I think onAfterK2Save SImple Image Gallery plugin function is now creating this problem. It does what it should but with K2 items, not categories!
At the end, category IS created and it works just fine, it just throws 1054 error since it can not find field "gallery" in #__k2_categories table.

Can you please confirm this?

I just did the upgrade: www.avialogs.com/aircraft-s/supermarine/itemlist/category/823-spitfire

All items have images, the whole site is impacted, (more than 17k items)

Additionally, you can momentarily upgrade to 2.10.1 if you want and notify me with the pages that have issues to have a quick look.

Nothing was deleted and the problem is reproducible, I just used the built-in upgrade process in Joomla as I do usually.

Hello,

All items pics in directory stopped to appear after the upgrade, Image url is not valid and the name of the item appears twice...
No code change was done on my side, it is a custom k2 template working since Joomla 2.5.
I downgraded K2 and it solved the problem


- Do you have an ETA for a fix or can you point on code change that would contribute to this ?

Thanks

Benoit

OK. how can I upgrade k2 ?

Upgrade both please, especially K2 which is years old.

Version 2.10.1 was released just 2 days ago.