CE U14 - File Specific - File Opens then CONNECT closes - OK in SS10


I have a file that opens fine in SS10 MicroStation, but when I try to open it in CONNECT, CONNECT opens, I can see the file (simple 3d house) then CONNECT automatically closes.
Anyone ever seen anything like this? Copied the graphics into another dgn (merge into master) and that fixed the problem. I'm relatively new to CONNECT so maybe I'm missing something.
Any idea what might cause this?


Tom F.

House1.dgnFile attached