Viktoria,
We can not give the exact steps, but in a separate message we could reproduce one of the problems:
What we have observed is that generally the problems deleting or renaming units are produced when there are a lot of open files in Visual Studio.
Please, what it is very important to us, if possible, is that the problem of Classof and mapped be fixed for the next version of Elements Beta, since is making us difficult keeping on developing our project.
Thank you very much.
Best regards,
Jose A.