Can not debug when using Creator 2.0 alpha with Qt 4.6.2 release

With a clean install of Qt Creator 2.0 alpha 1, and Qt 4.6.2 release binary on Windows 7 x64, debugging results in error: "Executable failed: During startup program exited with code 0xc0000135."

The default gdb used in Qt Creator now is "gdb-i686-pc-mingw32.exe". Using this setting, no debug session is possible. Setting gdb back to the one in mingw enables debugging but lose smart formatting of variables. All variables in debugger panel shows "n/a" or just raw values.