That is shown periodically and the timestamp for when it was last shown is stored in the config file. Unfortunately, it doesn't use a simple string. But, I have a sample that sets the date to about 8 years in the future.
If you add the following lines to the "ApplicationPreferences" settings, it should prevent these popups for a while:
Code:
MarkAsFinishedLastShown=@Variant(\0\0\0\x10\0%\x94h\x3!>i\x2)
MarkAsUnreadLastShown=@Variant(\0\0\0\x10\0%\x94h\x3!>i\x2)