next update:

yesterday everything worked fine and as normal for the first time...?!
I could import my library with my C15 and the new appeared on the screen. After that the C15 showed the known message that importing the library was completed.

I don´t know why it worked again! Maybe an internal error was solved? Does it depend on the Albums that shall be imported?

I don´t know...

Regards
MLsound

ML Expression 13A, AVM Ovation SA8.2, Sooloos C15, 818v3