upgrading from 4.1.4 to 4.2.0

[jacek]

Yes, if i copy dlls for each library i use(qtcore, qtsql,qtgui...etc.) my project works properly with qt 4.2.0.

Then the problem lies in paths, just as jpn suggested.

PATH: C:\Qt\4.2.0;

Shouldn't it be: C:\Qt\4.2.0\bin?