JEM - Module-Basic Stopped Working

1. Are your events on main menu in the category "Events"? (as depebo mentioned)

The menu is pointing to JEM » Simplelist. It doesn't ask to select a category.

2. What does the module class suffix "_next-event" do?

That's a class to style the event.

3. Your date/time are formatted interesting, take a look here: www.php.net/manual/en/function.date.php
Default values are: D, j. F Y and %H:%M

Thanks for this.

What's odd thing is that I did not make any changes to the module. I only noticed that the upcoming event was not showing. I also created a new one and I'm having the same issue.

Thanks anyway.

I would say: too much help for nothing. We have nearly no information about the changes you made and what they are doing.So we can't reproduce your problem. My proposal for such cases: Go back to step one: load a clean JEM on a clean Joomla!
EDIT: And please can you specify/actualise all your information about your system: which Joomla! which JEM which additional template and additional templates, which changes you made.
Perhaps it could help if you give the link to your URL.

OK. I'll get back with all that information. But FYI so far all the modules that I tried - none of them are working.