Are you using it with the Model Reflection Module? It is needed to check the Mendix domain model so you have something to map your data to.
Well it is now 10th of July 2014. I've downloaded the latest Database Reflection from app store. ( for Mx5). The bugs is there again. I wrote 'again', because the previous version of the module in MX4 was good.
I had exported all of my definitions to XML a few months ago and imported now again in MX5 and that works without any problem. But adding extra columns or creating new definitions is now not possible.
Second - In Tablemapping_Edit, clicking on tab-sheet "Reference" will close the form ( in run time)