Hi, Ken.
The problem isn’t with the other authors; the problem is with LearnPress 3.x. Other developers cannot fix bugs with your product. Please don’t ask me to do that again.
My suspicionis that in your upgrade, you’ve done something that affects how core WordPress exposes files based on user permission levels, and you did not take into account how other plugins might be adversely affected by your tweaking of the file-permissions system.
Is it possible to obtain a downgrade to the last stable release of the 2.x line?
As point of reference, the 3.0.1 release did not fix these problems.