I have created a four layer pcb in Ultiboard 11. When I try to export as dxf, the application freezes. I have never had a problem exporting dxfs in the past when using Ultiboard 11. Are there any known problems with dxf exports from Ultiboard 11?
I opened your file Ultiboard 11 and was able to export the DXF without a problem. The file is 17Mb so I can't attach it here.
Try to export your design to two files with the layers split between them. I know it's inconvenient but I can't really think of something since the export is working fine with me.
Components who do not have footprints do not transfer from Multisim to Ultiboard, you must assign a footprint for the component in Multisim.
Please post your future questions in a new thread so you guarantee a response for them.