Same issues on many seadrive clients, both Windows and Mac. No data yet for Linux ones.
See my post here: SeaDrive 2.0.4 - Error when accessing shared library
On a Mac with SeaDrive 2.0.6 which experienced the problem I tried logging out without cleaning the cache. Loggin in, the error was there again.
I then logged out and instructed SeaDrive to remove the cache.
I checked the .seadrive cache directory - 34GB were still in use by this RO “shared to all” library, in a delete-<libraryID>.
Then I logged in again on SeaDrive. The re-caching lasted for a long time. The 34GB started being removed, until the cache directory was empty.
By browsing the library only the opened files were cached.
The original error hasn’t appeared again yet.