OK, this is the problem: I develop a considerable big Qt app using Qt 3.1 in redhat 6.2. When I install the redhat 7.3, it have qt3.0.3, I try to run my executable (compiled in 6.2) and it produce an SEGMENTATION FAULT.

I WANT TO KNOW WHY?

Could it be a problem with the version of QT? with the shared libraries? with memory management?

How I can obtain only executables that don´t present this problems and can run freely without problems?

Why the QT designer don´t recognize my old projet that after this situation work finely?

does i have redo my widgets?

Please, I have all my hopes in this forum ...

Andres

A segmentation fault is usually caused by trying to write to memory you don't have permission too, or deleting something that doesn't actually exist ( unitialised pointers ).

Its normally a bug in your code, 7.3 probably is using more up to date libs, and now your program is causing a problem. Step through the code using a debugger, till the problem occurs

It will probably be in a loop, or near a new/delete. Check every pointer. You've probably got away with till now, with the update, things might be tighter with memory, or the system is watching more closely.