For about two weeks now our Joomla/K2/Media Manager returns "Error: Invalid backend response.Data is empty."
I tried disabling error reporting and the solution in thread www.joomlaworks.net/forum/k2-en/28435-resolved-invalid-backend-response-data-is-empty#157302. Both did not help.

For me the strange thing is that the problem seems to be kind of slowly progressing. At first only I had the problem on my computer, then a few days later somebody else started having the problem but at first switching to another browser helped and then it stopped working there as well.

Screenshot: imgur.com/a/m4R0R

Ok,

Please do not double post.
I have already posted a reply at that thread, Lets continue our discussion there.

Sorry, thought it might be necessary, because the other thread was old and marked 'solved'.

Unfortunately double posting only slows down the answering process.