Firefox 4, Movies, and Netflix no longer working

[Saturn2888]

I can no longer get Firefox 4, Movies, or Netflix working with any of my DisplayLink monitors or adapters. I've tried both 32-bit and 64-bit Windows 7 Professional on Intel and AMD graphics respectively to no avail. I don't know what happened, but it used to work in 5.6 and no longer does.

I tried both 5.6.30986 and 5.6.31870. I even reverted back to 5.6.30986 thinking that would solve it, nope. I've even restarted many times. I think it used to work in 5.6.29529 (the beta from January 2011 http://www.displaylink.org/forum/showthread.php?t=572), but I cannot confirm that at this time. Is there any reason for this to have stopped working? Is there any way to fix it?

Attached is my DL_support_tool log from after I reverted back to 5.6.30986.