I've been having regular (and seemingly randomly timed) Xorg segfaults, approx 2-3 per day, which can be traced to librecord.so. I get kicked out to the ubuntu login prompt. There is a discussion of the problem here: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/774978
Post #38 summarises it I think. The errors in my xorg.log are the same as those seen in that thread, i.e. something like 
..... 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f8335203000+0xfc60) [0x7f8335212c60]
[ 15223.014] 3: /usr/lib/xorg/modules/extensions/librecord.so (0x7f8332bb8000+0x2920) [0x7f8332bba920] ......

The suggested solution in that thread is to disable librecord.so, which stops the crashes for me, however workrave requires librecord to work. 
This happens for me in both unity and gnome 3 (i'm running ubuntu 11.10). Not sure how many people this affects, or how easy it would be for workrave to avoid using librecord?
Regards

I just added a new activity monitor based on the XScreenSaver extension.

The order in which workrave tries the different monitors can be configured at compile time:

configure ... --enable-monitors=screensaver,x11events,record

The default to use can be changed using gsettings:

gsettings set org.workrave.advanced monitor record

No crashes for me since the update. Brilliant, thanks!