@CybeX Well, the debugger shows a as "<not accessible>", so unless its value has been optimized out that seems to be the cause of the SEGV. I admit I don't know how/why, assuming you only put items into fileInfoImageList via the code you show. I would start by just checking you can visit/print out all the QFileInfos in your lists before you start the std::sort()? I would also force a complete rebuild just to make sure. The placement of the debug breakpoint on line #319 which is blank looks odd to me, it's not supposed to do that....

Solved. Just started compiling 5.4.2 and just small issues that are easier to resolve.

Hello guys Thanks a lot for the answers. Your replies got me thinking and I recalled how includes can mess things up. I removed a couple of the include files in some of my header files that turned out to be unnecessary. After removing all the header files while still being able to compile then the program was running again perfectly. Regards Sebastian Aslund

exactly. thank you.