Every time I load an exercise where an apostrophe is involved a database error 309 about permissions not being granted. I have a snapshot of the error in case you needed. I've already granted read and write permissions to all the other groups and still not working.
Is this a known issue?

We are sorry about that. The software version is not up to date, there are unfortunately a lot of known issues. We spent a lot of time in the online version and didn't had/have enough time to publish a new software version yet.

To solve your problem, there are two ways:
1. Switch to the online version, which is much better, up to date and has more features.
2. Replace all single apostrophes with two apostrophes before creating an own lesson. That should work.

All the best from Berlin,
Your Tipp10 Team