And actually, I have the exact same problem with my other Qt app, QTeachMe and the issue is discussed in this thread:
http://talk.maemo.org/showthread.php...744#post568744

Attila77 does report that it is working (provided that Maemo 4.1 == Diablo ...) for him in this post:

http://talk.maemo.org/showpost.php?p=565996&postcount=7

So we might want to get in touch with him to see what's different for him...