Bunsen, thank you very, very much! I managed to reproduce the bug, the problem is that I free a non allocated memory area.
You are right, LFRelease(dateText) does some bogus things that it shouldn't do.

What I don't know is why it does them, it looks like the dateText object somehow loses its retain count without an obvious reason. I will edit the post once I understand this completely, in the meantime: Stay away from LFDescription() (You can remove the very first timer to see the full demo (hopefully))