Well, fortunately through some more tweaking I made the problem go away, so it's going to be hard to reproduce what I was experiencing. At this point I guess we can chalk it up to upgrade quirkiness. Basically what I did to fix it was to delete my xorg.conf, restart gdm, and use the "screen resolution" tool to re-set up my screens. After that it seemed to work again. My guess is that the applet/panel was "confused" about where one screen started and the other one ended.
Having said that, if someone wants to close this bug, I wouldn't be offended ;-) -- Window list applet "show windows on current workspace" does not work with dual monitors https://bugs.launchpad.net/bugs/299949 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs