gdb won't stop at breakpoint after disable, enable

Tried with Creator from nightly build ( qt-creator-win-opensource-2.0.90-201009060108-setup.exe , 979998f4cf ) and collidingmice example from Qt 4.7.0 branch ( 33a3496032 ).

Build the example, debug it.
Insert a breakpoint, e.g. at line 159 of mouse.cpp:

    foreach (QGraphicsItem *item, dangerMice) {

Breakpoint is being hit, execution stops.
Disable breakpoint, continue debugging.
Enable breakpoint, execution does not stop.
Remove breakpoint, insert it again, execution stops.