On Windows XP have been installed multiple versions of Qt: 2010.05 (4.7), QtSDK Beta (4.7.2).
When I create a basic project template "Qt GUI Application", then run and debug, in the console watch a lot of repetitions of the following lines:

while parsing target library list: not well-formed (invalid token)

Assuming that the problem in the debugger.
I removed all versions of Qt, and install back to 2010.05 (4.7).
But again the same thing: "while parsing target library list: not well-formed (invalid token)"

This error prevents the program being debugged.
When debugging, if I set a breakpoint in the source, then wait for execution when program runs to it, and press F10, QtCreator switches to disassembler and all next pressing F10 does not return to the source.

Link to forum:
http://developer.qt.nokia.com/forums/viewthread/5041/