Thanks for your quick answer. I've just tested CAVS with HIPS disabled and still Cryptainer loads OK but can't unload and close.
I've tried disabling On Access protection too and the problem remains. I've tested without and with system restarts in between (system switch off rather, as it wouldn't shutdown with Cryptainer running). It seems as if CAVS were too clever, possibly detecting the file volume opened by Cryptainer and getting exclusive control of it (?).
I'll wait for the CAVS update you mention; I really find it much lighter on resources than other tools and the update mechanism is great, dowloading by parts, reporting progress and resuming after disconnection, excellent.
Kind regards,
Pixel
CAV3 will be much better.
I am guessing it's a service in CAV2. Thanks for your patience!

Josh