Itgenfby111: I/O error when ensuring bytes written / access is denied

This issue recurs when logging in via the Sumatra Server:

itgenfby111:
I/O error when ensuring bytes written. (-2147024891).
itgenclr004: Access to the path ‘/cache/database.invantive.com/home/Invantive/Cache/in/disk/user/###@#####.nl/1h/nl/111111111/ExactOnlineREST_System_SystemDiv-C4795294371F598C.cache’ is denied.
itgenclr004: Permission denied.

The user can log in normally.
What’s going on here?

This concerned an internal permissions issue in Invantive Cloud when updating the caches. This problem should no longer occur.

This question was automatically closed after 1 week of inactivity. The last given answer has been marked as the solution.

Please submit a new question via a separate topic if the issue recurs. Please include a link to this topic in the new question by pasting its URL in the text.