There have been a few instances where I have run into .idw files of .iam
files and some of the part's lines disappeared in section views of round
assemblies. This was very inconsistent as in some of the section views,
there were no problems while in others, one half would be ok while the other
half would be missing some lines, but not the section lines - the section
lines were always visible. Specifically, all lines associated to a
particular part. The missing lines from view to view (if there is a problem
with more than one anyway) are not always the same part.