After a time, Middle-click window moving stops functioning and I have no idea how long DF has been running, just that I notice middle-clicking no longer moves the window. I can't detect any common thread that causes this behavior ... seems a random event. Exiting and restarting DF restores the function. Running Win7 eval. build 7100, 64-bit

Nope, no error message. Don't know anything happened until I try to move a window. Seems to happen very sporadically. Just enabled log so we'll see. Thanks.

I am having the same problems. I don't have "pause system hooks when a fullscreen application is detected" checked. Also, the "enable global..." settings in troubleshooting are enabled. It's just that every so often, I notice that I can't middle click on a titlebar.

Are either of you experiencing this after sleep / hibernation, or is this during active use?

Also, are either of you using Logitech SetPoint software?

I can also attest to this. Didn't really bother testing what might cause it.

No Logitech SetPoint software (I use Logitech Profiler though).