Rated 5 out of 5 stars
I use Tbird 68.10.0 & Owl 0.7.7.4 on Linux, and often the Inbox is empty blank. I click an other folder the problem temporarily improves.
Can you please try with 0.7.7.5? We made additional changes, which hopefully resolves the problem entirely. Can you please update your rating accordingly?
Really sorry for the troubles you and others had.