Qt Creator loses bookmarks

Qt Creator 2.7.0 (don't know about other versions, never tried them) loses bookmarks.
What i do/how to reproduce:
1) create a new Qt GUI Application with just a single main window
2) enter/make sure you're in Edit mode (dunno how it behaves in other views, won't even bother trying)
3) place a bookmark on a line in any of mainwindow.cpp or mainwindow.h
4) close Qt Creator
5) restart Qt Creator: the bookmark IS still there
6) close Qt Ctreator
7) restart Qt Creator: the bookmark is LOST

I also tried placing 3 bookmarks; in this case, at step (6) above only one bookmark is lost (the last one?), then if you continue closing and restarting Qt Creator all the remaining bookmarks are incrementally lost (one more at each restart).

To make the long story short, Qt Creator is UNUSABLE for anything more than really small projects until this is fixed.