QT doesnot show any application output

[AlexSudnik]

Hm,do you recieve the error signal all the time ? Are there any debug messages when you run your application with all the slots connected ?
I mean,it seems impossible that timer activation can somehow affect widget's layout,there's got to be smth. else,i guess.

P.S:by the way,i don't see the line where you initialize the timer object in your class constructor...