QLabel->setText() sometimes not working

[wysota]

Then how SHOULD I use the timer?

You should check the time elapsed instead of bumping the value one by one. To simplify the situation you could use QTimeLine.

The QProgressBar updates fine using the same timer and the same method!

Like I said, I doubt this has any influence on what you observe.

I know for a small project like this, it is silly to use the Graphics View architecture, but for the original project this is a requirement. I did however removed the Graphics View architecture as you suggested and then the QLabel updated correctly. However the original project still requires the Graphics View architecture for animations and stuff and I was under the impression that Qt 4.6.2 is a stable release.

Ok but now we know QLabel::setText() is not the one causing problems.

[ChrisW67]

The example above works just fine for me on Linux with Qt 4.6.2. No skipped output. Could be a Windows-ism.

[Zlatomir]

I reproduced the error noticed by the original project to a smaller compilable project: ...

ChrisW67, it works for me too, on Windows (7) and Qt 4.6.2, so that's no windows issue.