Has LMS new bug with german "Umlaute" at top folder from library?

Hello,

since some LMS Versions 7.9.1 (i don't recognize exactly at which version the bug is born:-) the LMS don't show correct the german "Umlaute" on the top folder (music folder) of the library. Inside an album the "Umlaute" are shown correctly.
This was never a problem since (about 5 years) i'm a LMS user.

The problem is definitly on LMS because the wrong displayed "Umlaute" are shown at Squeeze -> Touch, Radio, pCP, SqueezePlay and Android Apps.
I complete rebuild the database twice or more, but didn't help.

Regards
Oli