Microstation Connect Update 17 - Material assignment problems


I've finally started using the connect edition of Microstation and am getting some very odd behaviour with material assignments etc. This is an old model (from V8i) but I have converted all solids to Parametric. 

Please see the video that I think shows what's happening. MS_Material_issue.mp4

Open standard palette.

Assign a material.

Assign a second material - Alter rotation of pattern map - 90 degrees 

First material disappears even though still assigned - Reassign material

Open second palette - assign material 

Open third Palette - assign material 

delete assignment - all materials disappear even though assignments are still there?

Any ideas?? I can attach the dgn if this helps.