I am unable to unlock my vaults - "drive is inaccessible"

Well, you can have a look at the known issues category.
You’ll find this: https://community.cryptomator.org/t/4-gib-file-size-limit-on-virtual-drive
and this: https://community.cryptomator.org/t/virtual-drive-shows-capacity-of-system-partition-c
(these are the 2 restrictions I’m actually aware of)