the lastest update to macOS High Sierra 10.13.3 shows an interesting remark in the release notes:
“Resolves an issue that could cause your Mac to stop responding when connected to an SMB server” (just in the English version, it’s missing in the German version, source: https://9to5mac.com/2018/01/23/macos-10-13-3/)
I tried again yesterday after applying the patch. The problem is still there. I believe they said it’s a WebDAV thing, not SMB. So, I still can’t use Cryptomator.
Also, I’m not sure what happened and when, but I was the one that started this thread. I don’t remember creating a new account, but my password manager says I’m now Subdevil instead of Submarine89.