Same here, after the R12 update QB DT Ent V23 will not run on Server 2012,

We are still able to use as a share file for local desktops. But on the server the program is a mess.

QB/Intuit states V23 is incompatible with Server 2012.   And there's no solution. Or none that's acceptable.

If you go back to R11 in multiuser you are not going to get very far...

We have six users and this is a mess.  QB Intuit seem to always find ways to screw things up.