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When opening older scenes (maya2012) in maya 2015, occasionally all of my material and connections to geometry will be missing. Only the default lambert material is present and everything else is missing. Any ideas why? Seems inconsistent as some other scenes seem to open fine without any broken/ missing connections.
Update... as a workaround I have been exporting objects/ scenes from 2012 as .fbx and opening/ importing in 2015. However all my references end up unloaded. Anyway to keep them in tact whne exporting fbx? I would keep 'preseve references" & 'export unloaded references" checked but they still aren't there when importing into 2015.