I tried the 3.55.11 beta and now when I run my Windows Live Messenger 14.0.8117.416 on my 32-bit Windows XP, under Tools --> Audio and Video setup, I got the pop-up message "We are unable to run audio and video setup".

Running the same Windows Live Messenger 14.0.8117.416 on my 32-bit Windows XP outside Sandboxie, everything is normal and working.

What has changed in these betas ?

Actually this problem is due to an important change in Sandboxie that I made in version 3.51, which made Sandboxie a bit better overall, but obviously there are still minor glitches here and there to take care of.

This problem should be fixed in version 3.55.12. Thanks for bringing it to attention.

I confirm that my reported problem with audio and video setuo is now fixed in 3.55.12.

Thanks, tzuk, for your immediate attention and fast fix !