CoursePress Pro: Lot's of problems after update to version 2

Hi There,

Unfortunately, CoursePress does not work reliably after the update:

1. The functionality with "Previous" and "Next" is reliable: Although all questions are correctly answered, we sometimes do not come to the next lesson by "Next".

2. Furthermore, we have repeatedly deleted the seminar leader / trainer as well as the course language, but they are always showed again.

3. Although in the unit area a response is marked as correct, it is marked wrong in the user area and there is no way to enter it again. (This is set up in the individual units - Retry> 10)