Hi, when using skritter before, I got this message stating that I have to reinstall skritter. What's this all about?

Thanks for your reply!

It refers to a problem where some sync was interrupted or something and you had incomplete local data downloaded to your iOS device. After showing the message, the app tries to reset the local database and download everything afresh from the Skritter servers. Usually that takes care of whatever weird state it got into in the first place.

If you see it multiple times on a recurring basis, then that could be a worse problem. If it was just once, and then it worked afterward, after the fresh sync, then it's probably nothing to worry about (although an inconvenience for you).