I have the following problem on Nokia 6681:
I create and register an observer and it starts observing the Calendar file (C:\System\Data\Calendar). The changes are sent and everything is ok. The problem occurs when I restart the phone. According to the documentation, the observer shall continue its work after restart, but it does not on 6681.
I tested the same application on other S60 and S80 models and the problem does not exist.
I looked at the afore mentioned Calendar file. Each time I restart the phone this file grows (even if i have not touched the calendar and even on a newly formatted phone). On other models the file is not touched on restart.

Can somebody tell me something more on this issue - why this happens and if there is a workaround?

Thank you in advance for the help.