yes my delete key has been intermittent with microstation V8i and CE but when it happens I use the mstn X delete icon and then the keyboard works again .. well until next time .. go figure.... I give up trying to fix stuff like this...
I would try 3DS or sketchup format if microstation can export that. You could try opening the exported IFC in something like BIMcollab Zoom to see if the file is correct. IFC should really be the safest option, so it is strange it doesn't give good results.
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