[Qt-interest] weird event loop hang with Qt Mac 64-bit Cocoa and QStackedLayout?

[Paul Miller]

I'm at a loss here - have two applications that have QStackedLayouts in 
them. Built with Qt 4.7 (64 bit) Cocoa (also tried with 4.6, same 
results) - works fine on my machine(s).

Sent to a user with no dev tools/Qt installed. On his machine, most of 
the time, after switching the current widget his program will just hang 
for about 10-15 seconds. He sent me a sample report and most of the time 
is just waiting in the kernel message trap. After awhile, the program 
continues on normally.

I've never been able to repro this.

Program rebuilt with 32 bit CARBON version of Qt works FINE.

Anyone heard of anything like this? I'm totally STUMPED.