Can't create Bootable Media, Error 0x40011

Hello,
I'm using ABR 10.0.13762, German, on Windows 7 64Bit English.
When I try to create an ISO file, I get an error :

E00040011: Can't upload the components
Please reinstall Acronis Media Builder
Errorcode : 0x40011
The specified file doesn't exist.

I have translated the texts, see attached file with a snapshot of the dialog.

The very annyoing side effect is that every activity in the dashboard is tagged with 'Warning'.

Reinstalling the media builder doesn't help.

Any ideas ?

Regards,
Alex