You did it again Alexey, thank you!
Sure enough all the layers throwing this error had an IMAGE (raster) field. I deleted them out as we are using HyperPic mobile for image management that uses a PhotoID (text) field. Voila, all users can now edit attributes.
Regarding understanding the implications of unregistering. Because the users have yet to add permanent data there is no worries about the A and D tables being deleted.
Thanks again!