Problem - Loosing the call register

Hi Felipe,
I noticed that my phone is loosing the call log data recently. What happens is: When I have a missed call, the call register does not register any calls afterwards, whether out or in. Unistalled MyContacts and problem disappear. Any idea why and how?
To make things more clear for you, I use stock kernel, and other programs that might be effecting call register are: extended call log, call notify, catblock.. My intention was try to uninstall-install all of them in turn to find out which one causes this, started with MyContacts and it happened to be the one.
If you want me to do some more testing I am willing to do.