Thank you for your reply.
To answer your questions:
- I installed CC on non-admin account (as usual over years); then, of course,
granted admin rights when UAC pops up.
- With 6.04 the OS was on rev 21H2, with 6.05 now on 22H2, same result.
- It is the free version, so I can't try "all users".
What I see is, that on start on admin account (and also on start of the
portable version) a file gc_...dll is created in the program's folder,
which disappears after a second or so.
On non-admin account there is no write access to that folder, so that
may cancel the start.
For testing, I gave the folder full access on non-admin account (which can't
be a final solution), and CC 6.x runs.