Hi,
I was experiencing this problem with YouTube and Vimeo.
To fix this go to the following file:
plugins/content/jw_allvideos/includes/sources.php
For Vimeo look for line 725 and replace
<object type=\"application/x-shockwave-flash\" style=\"width:{WIDTH}px;height:{HEIGHT}px;\" data=\"https://vimeo.com/moogaloop.swf?clip_id={SOURCE}&server=www.vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1\" title=\"JoomlaWorks AllVideos Player\">
with
<object type=\"application/x-shockwave-flash\" style=\"width:{WIDTH}px;height:{HEIGHT}px;\" data=\"https://vimeo.com/moogaloop.swf?clip_id={SOURCE}&server=www.vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1&autoplay={AUTOPLAY}\" title=\"JoomlaWorks AllVideos Player\">
For YouTube look for line 229 and replace
<object type=\"application/x-shockwave-flash\" style=\"width:{WIDTH}px;height:{HEIGHT}px;\" data=\"https://www.youtube.com/v/{SOURCE}&hl=en&fs=1\" title=\"JoomlaWorks AllVideos Player\">
with
<object type=\"application/x-shockwave-flash\" style=\"width:{WIDTH}px;height:{HEIGHT}px;\" data=\"https://www.youtube.com/v/{SOURCE}&hl=en&fs=1&autoplay={AUTOPLAY}\" title=\"JoomlaWorks AllVideos Player\">
Perform similar actions for other players.
Hope this helps.
