Comment 18 for bug 949414

What is strange is that gtk+ v2 applications' widgets (including buttons and menus) are working correctly (tested on firefox (gtk2/xul), liferea, thewidgetfactory). Xev reports the same events for mouse and touchpad.

I was able to reproduce this on Acer Aspire One A150, Lenovo E420 and EMachines E732G touchpads (all synaptics).

It is also interesting that nautilus continues highlighting the folders and files when touchpad is used to move the mouse across the file list, however the widgets in the bar do not react.

Sometimes in order to trigger this issue one needs to click with touchpad somewhere first, the menus react properly when you start using mouse then swich to touchpad until the first click.