Can't drag or add any widgets onto mainwindow.ui in design mode
I'm using Linux Mint 17.2. I haven't used QT Creator for a year or two. I installed the version from the package manager and created a new widgets application and discovered I was unable to drag any widgets on the new main window. I opened up one of my old projects and noticed I could drag around the existing widgets but again I was unable to add any new ones.
I uninstalled this version of QT Creator and downloaded and installed the latest open source version (3.5.0) from the QT website.
I still have the same problem. I feel like I'm going bananas because I haven't found anyone else with the same issue yet.
Any assistance would be greatly appreciated.
Had similar problem.
Source turn out to be my ubuntu 23 which was newer then official supported 22 LTS. Reinstaling system to 22 LTS helped.