Good morning.  Since upgrading to SW 2014 from 2013 we are having a major issue working on a mapped network drive.  I will try to describe the issue as best as possible.

When opening up an assembly on the server, opening up a sub-assembly which has components in lightweight mode causes the following issues (jpg's to illustrate step by step):

Setting the entire assembly to resolved solves the issue.  I believe this has something to do with the model document pathing, because the problem does not occur when working with a duplicate file location locally on our C:\ drives.