PFF Cross-Platform Extension Weirdness

I've got PFF 1.5 cross platform running on my USB key. The browser itself works just fine on both platforms, but I've been seeing some strange behavior with extensions.

I'm running, among others, Greasemonkey and Adblock Plus. I set them up on OS X, and everything was fine. Half the time when I run PFF, Adblock works fine and all my GM scripts work fine. The other half, neither work at all. Both extensions run, but they don't actually do anything. The menus are up, GM claims the scripts are running, but nothing actually happens. In fact, even the DOM inspector doesn't work. It runs, but it sees no nodes. This strikes me as extraordinarily strange.

I may have brought this on myself. I've got my PFF profile syncing with my FF profile on my desktop, because I want to keep extensions, scripts, bookmarks etc. the same. It worked fine last night, and today it's been 50/50 on my OS X computer at work, but half the time, nothin'. Any ideas?

Thanks.