I what to look in the help index for something like qtextdialog.
when I open the qt creator->help->index->look for, and i type "qtextd", it creashes on the 'd'.
try it with your version if it crashes too.
Nope, it does not crash on creator 3.0 on Ubuntu and also no problem in creator 2.7 on windows.
I doubt that it would be a general problem only with this text only.
