Sadly, although I actually like Revit 2010 I have had to go back to Revit 2009 after discovering that plotting to pdf randomly misses elements out of the drawings (see attached for typical example - screenshot showing Revit 2010 sheet view and then pdf output of same).
I've put up with the odd crash about once a day but this is fatal - I can't be checking every plot for missing elements - it's already caused considerable embarrassment sending drawings to other consultants with elements missing.
No idea if it also affects paper plotting - I'll check when I have time - but most output these days is to pdf.
I've tried it on a large-ish project and a tiny project and both have the same problems.
The elements disappearing are not entirely random I notice - there is a certain repeat to the elements involved but it changes each time the sheets are plotted.
I've reported it to Autodesk.
For the record I've tested this on two separate PCs with quad cores - both running Vista 64 - both with Adobe Acrobat 9 installed -and both exhibit the same problem.
I've tried to think of every possible reason why the particular elements should disappear but apart from being upgraded from 2009 to 2010 there is nothing unusual about the projects.
Wouldn't surprise me if it was Adobe's fault somehow but it all works perfectly in Revit 2009 so I'm going back to using that until such time as this is fixed/explained etc...
/later...
Just tried plotting using Win2PDF instead of Acrobat 9 and the same problem occurrs