good to hear that you were able to fix it.
As I said above, this is more likely to be a temporary problem in User Role Editor.
There's nothing really that I can change in TablePress here. TablePress (when it is activated) adds the initial access capabilities to WordPress. In your case, User Role Editor then somehow removes these again, maybe on accident when someone edited the capabilities.
There's usually no problem in using User Role Editor and TablePress together, and many people do it. One just has to be careful to not accidentally remove the TablePress capabilities from a user role.
(I personally use the "Members" plugin for such operations, by the way, which also has nice user role component.)