I have this problem with severalt sites build on uber. Go to front end log in, click icon for editing in the right corner of the module, the page restart, at the bottom of the page there is a red box, where the editing should show I guess. At the backend now the module have got a check out status, I remove that and try again to log in from front end, but the same thing happens.
also think that it is strange that my othert web pages build on other templates like, JA Small Biz and JA Company have no problem.
I'm using Joomla 3.8.6
I now have 4 sites where I use Uber and can not edit modules from front end.
And I have 2 sites where I use Uber I can edit modules from front end.
Regards Tor Hølleland