We have a class ongoing on thursday nights, I checked the database in the afternoon before the first class and there were registrations, now they seem to be gone from sight.

I'm wondering if this class is Taming the Mind, starting Aug 27th?  Since it is now partially in the past, you have to pull up "past programs" to see the Aug 27th class and that one does have registrations.

Here's the direct link -- ID here)

To find it on the program listing page, click the past box and pull down past month to get it to appear.  

With the program listings, you can sort them by clicking the blue column headers. You will notice that Taming the mind is in twice -- the Aug 27th and then an October one  (maybe this is the one you saw that had no registrations).