FOSS gamedev and creative worlds

I am trying to correct a slow drift, a slow rotate motion from the mouselook mode.

Device #1:
Asus Transformer, 32 bit OS, small tablet

Device #2:
Sony Vaio Laptop, 64 bit OS, 15" screen (the one i want to work)

Troubleshooting Steps:
. Tried my wireless mouse on both devices (trackpad off)
. Tried without a wireless mouse (only trackpad) on both devices
. Tried both 64 bit and 32 bit minetest on #2
. Tried a variety of changes (fullscreen, etc.) to minetest.conf on #2

Device #1 works fine in all conditions. Given the tiny screen, that is a harder device to play on, or develop mods on.

On Device #2 in all test cases, in normal game mode, the view slowly rotates. If i click the mouse, the rotation stops. In menu mode (like inventory), there is absolutely no motion of the cursor. I am excited about making some mods, and hope we can figure this out. :)

Yes, this has happened with me before. I just tried restarting X, and it worked just fine. I actually presumed it was a problem with me, bu tI have had this before as well.

Sorry, I should have included, Windows 8.1 on both devices. I'm going to test on #2 with Linux as well, just for completeness. (who can tell I'm a developer who spent time in the tech support pit when I was young?)

Rebooting the OS did not have any effect.