I have same problem since I've installed v.1.5.4 (before I use v0.9), some keys stop working on the keyboard (never the same), when I left click it select all as if I pressed the shift key and double click do nothing.
OS : Windows 7 64-bit
key combination : SHIFT+CTRL+ALT+O
Keyboard : Logitech diNovo Cordless
Mouse : MX Revolution
mouse button : secondary wheel