Deleting of files does not work

Hi,
since C1 7.1.6 I can not delete raw files by hitting the delete-key.
Also using key short cut Ctr+Delete does not work.
When I use ALT+Delete deleting works but the raw files is gone for ever.

I updated to the latest version 7.2 but the problem is still there.

I use an ACER Aspire 5755G, i7 Intel QM, 16GB RAM, GEFORCE 2GB, 250 GB SSD.

Capture One and the raw files are stored on the SSD but deleting of files failes all the time.
For an professional program it is rather disapointing.

Regards

Arthur
Cologne, Germany