Hi there,
If you think the issue with the notification has come up after you installed the Service Pack 1, you could probably try uninstalling it and then re-installing it again.This is just to isolate the cause of the issue.
Secondly, what kind of notification have you configured? MAPI or SMTP or something else? Are the notificiations not being sent after the daylight saving time changed?
Please let us know the answers to the questions mentioned above.
NOTE : If we do not receive your intimation within two business days, this post would be "assumed answered" and archived.