I often encounter problems debugging deferred C++ DLL CAs. Most of the
time DebugBreak() works. Now and then it won't and then I use __asm {
int 3 } which, for some reason, tends to work more often than
DebugBreak. 

Then I encounter situations when even int 3 won't work in the sense that
Vista (and 4.0 Installer) does not offer me a chance to break into the
debugger but, instead, shows a dialog box saying "Windows installer
stopped working and was closed". 

In this dialog I can only press Close button and my installation appears
successful. I just appears so because the bunch of CA code that was
supposed to execute after int 3 didn't execute and that is fatal for my
apps.
If I remove int 3 (or DebugBreak()) then I don't see the dialog box
mentioned above and but that doesn't help my debugging.

Do you encounter similar problems and can anybody suggest reliable
method to break into deferred action DLL code?

Thanks!

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