Visual Studio 2010 managed debugger hangs after hitting a breakpoint by Amberg

While debugging a multi-threaded/process application (mixed WPF and WinForm). The debugger and the debugged application freeze. After detaching the debugger, the debugged process and visual studio behaves normal.

The problem occurs on all our development systems.

I have already tried the follow steps to solve this problem without success:
- enable / disable the host process
- tried to debug x86 and x64 processes
- launched visual studio with /SafeMode
- NGEN update
- disabled "property evaluation and other implicit function calls" in Debugging options
- disabled symbol servers
- disabled symbol loading

I have attached a debugger to visual studio during the debug session and there are some exceptions in the output:

(18d8.1708): C++ EH exception - code e06d7363 (first chance)
(18d8.1708): C++ EH exception - code e06d7363 (first chance)
..... // snip
(18d8.18dc): Unknown exception - code 80010005 (first chance)
..... // 20 seconds freeze until breakpoint hit in IDE

(18d8.18dc): Unknown exception - code 80010005 (first chance)
(18d8.18dc): C++ EH exception - code e06d7363 (first chance)
ModLoad: 365f0000 36665000 C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\Packages\Debugger\mcee.dll

// after continue execution debugger and debugged process freezes forever

(18d8.18dc): Unknown exception - code 80010005 (first chance)
ModLoad: 00000000`02b90000 00000000`02c1c000 C:\Windows\SysWOW64\UIAutomationCore.dll
(18d8.1a8c): CLR exception - code e0434352 (first chance)
(18d8.1a8c): CLR exception - code e0434352 (first chance)
(18d8.1a8c): CLR exception - code e0434352 (first chance)
(18d8.1a8c): CLR exception - code e0434352 (first chance)
(18d8.1a8c): CLR exception - code e0434352 (first chance)
(18d8.1a8c): CLR exception - code e0434352 (first chance)
(18d8.1a8c): CLR exception - code e0434352 (first chance)
(18d8.1a8c): CLR exception - code e0434352 (first chance)


I have attached a dump of both processes