Some notes from playing with the app on a Fedora 16 box running Chrome:
1. Using alt-drag to move without snapping to grid is a non-starter on Linux, where that combination is already bound by the window manager. Amusingly I note that Right-Click does work to do an unsnapped drag, but I think this is probably a mistake: it also pops up the context menu, which one has to be careful not to drag over.
2. The zoom popdown doesn't work on Linux, so zoom isn't possible. It seems like it's related to the attempt to use a "native" combo box (HTML " " tag, though Chrome doesn't actually implement this with a Gtk widget) in a "modal" HTML dialog. The native combo box in unix is a motif thing that doesn't work like it does in windows. Native controls in general are always bad for this reason.
3. The Flash plugin "allow" dialog on the GM (but interestingly not the player) screen doesn't work. It isn't apparently getting any input events. I worked around this by bringing up the default flash dialog and granting tokbox permissions manually. My guess is that it's related to the video window that was popped up on the same screen in GM mode. This does not exist in player mode.