The issue I'm having the following:
I can create a new node, I have two upload fields for images that can initially be uploaded no problem.
I can go back and edit node content and save, also no problem.
When I try to erase either image attachment and save the node I get a 500 error (Server Internal Error). Looking at the PHP logs this is what I'm getting:
[Wed Apr 25 23:34:51 2012] [warn] [client 50.138.84.100] mod_fcgid: stderr: PHP Fatal error: Call-time pass-by-reference has been removed in ../www/sites/all/modules/video/transcoders/video_ffmpeg.inc on line 49, referer: https://www.uleru.com/node/xxx/edit
This use to work a few weeks back and the last major change was a server upgrade of some of the packages (running Debian). Not sure if this was the conspirator but maybe some has seen something similar?
-------------------------------------------EDIT--------------------------------------------------
Doing a show on that package, that's exactly what happened, ffmpeg was deprecated by libav-tools. I'm trying to remember where to change the ffmpeg path in the Drupal Admin. Considering rolling back = /
This looks like the server upgrade included a switch to PHP 5.4 ("call-time pass-by-reference" got deprecated in 5.3, and removed in 5.4 - see Passing by Reference).
So this is likely a bug in video_ffmpeg.inc, in that it tries to pass a parameter by reference, which it should do only by declaring the parameter as a reference in the called functions signature.
For small example, see PHP 5.4 Call-time pass-by-reference - Easy fix available?