Mouse not crossing an invisible line

[Scyth]

Hi there!

I got a strange problem: My mouse in Windows guest / Linux host is sometimes not moving beyond invisible lines (horizontal as well as vertical).
No idea here where that could come from. I can only give you some symptoms and the tech specs:

- Only happens with mouse integration
- Happens with mouse as well as Wacom Bamboo Tablet
- The line I can non cross is consistent: from top to bottom and from left to right.
- After pushing the pointer hard against that line it is possible to move it around normally again.

- Linux host 12.04, 64 bit
- Windows 7 guest, 64 bit
- VboxAdditions installed
- USB2 support activated/installed
- Host is in dual-screen with Nvidia Geforce GTX 560, nvidia-settings 295.40

Following settings activated (just mentioning those that could be important)
- VT-x, AMD-V
- Nested Paging
- Absolute Mosepointer
- IO-APIC


Any suggestions or do you need more specs?

Thx,
Andy

[Y E T I]

Where is this line and is it on both displays?

[Scyth]

This invisible line is only in Win7 guest. The guest ist on my the bigger screen (secondary I believe).