MSTSC hangs with 100% of CPU on keyboard input

How to reproduce:

1. Run Remote Desktop from Start menu
2. Don't switch input focus to mstsc's edit controls
3. Type something with keyboard

Result: program hangs consuming 100% of CPU.

It can be terminated with task manager, then system continues to work normally.

This behaviour cannot be reproduced on Windows XP and 2003, so assuming the actual bug is not inside mstsc.

Debug log with comments and screenshot attached.