[quote author="Serenity" date="1416812336"]
Don't port your application if you don't need it!
I have now a lot of problems which are bugs in Qt5. For example: Closing a QWebWidget before completely loading a website causes to a segmentation fault. That's something, I can't solve at the moment and is a huge problem for me and my application. Nevertheless, I try something else, but it costs so much time, that I would never ever recommend someone to do a port from 4 to 5.
[/quote]
I too have this problem with the QWebView being closed while loading a page causing a Seg fault, only happening on OS X (windows version works fine). Using Mavericks Qt 5.4.
I would recommend to always upgrade to the latest Qt version. Yes it takes some time and work, but you ensure to have an easy time and small upgrade each Qt Version. If you wait too long to upgrade, it can become a bit messy. Also you are helping develop Qt by keeping it active and submitting bugs.
Just ported from 5.3.2 to 5.4
Only bug I had, some SSL errors now appear on the OS X version in the console ouput..
@QSslSocket: cannot call unresolved function SSL_get0_next_proto_negotiated@
Good luck