I am getting very frustrated with continuing issues with

I am getting very frustrated with continuing issues with this plugin.

1. A number of my students keep returning a 500 internal server error page when trying to log in. I have checked with my server provider and its not an issue with the server. The only way round it has been to delete their accounts and set up a new one but I have had to cut, paste and reenter all their assignments again!
2. One of the units says only 5 of 7 mandatory elements have been completed but in reality there are only 5 mandatory elements and they have been completed by one of my students but she isn't able to move on to next unit as it says it is only 91% completed!!!!!