Strange bug in the debugger!?

[Yes]

I did try the test you suggested, and I got the cout print that you added. The debugger continued to the test on line 3 (now in your example) and then jumped directly to line 8 which says "a is now equal to b". It did that, iteration after iteration, but when I looked at what had actually been printed, it had not written "a is now equal to b" even once (from what I can remember).

Now I can't compile the program because I get some strange error saying ":-1: error: [ui_mainwindow.h] Error 258" and "File not found" which I don't know what it means (I didn't know that I had such a file), so I can't currently do any more debugging. Thank you for the help I have got in this post, though.

[Lesiok]

ui_*.h are files generated by UI compiler from *.ui files. You have in project file mainwindow.ui but it is not compiled. It seems that your project is corrupted.