Workbench quits when trying to save a model (no replies)

Dear all,

I created a database with Workbench version 6.2.4.12437 build 2426 (64 bit) on a Windows 8.2 system.

Today I created an err model from the existing database. This works.

Whenever I want to save the model Workbench quits without an error message.

The same happens if I create a model from scratch.

Who can help?

Best regards
Jorg