Slow Mouse Movement after Upgrade to 4.1

Hi,

after upgrading my testserver from ESXi 4.0 U2 to Hypervisor 4.1 the mouse movement in the remote Console of vSphere Client ist very slow and it is hard to use.

This Problem occurs with Win 7 x64 or Win 2008 R2 as guest os only.

Remoting Win 2003 (x86) or Win XP (x86) guest works fine - no such issues.

I found this problem with VMWare Tools Version 4.xxx and V 8.x both .

Before updating to 4.1 remoting the Win 2008 R2 guest worked fine.

Does anybody else have this problems?

Does anybody have an idea how to solve it?