In the last Wip 12-11-2014 there are problem that was Ok in preview Builds.
Make2d , BooleanDifference
In the attached file booleandifference fails . I sent to you a crash report of make2d
BooleanDifferenceFailed.3dm (609.0 KB)
Hi Vittorio - thanks, I see that - added http://mcneel.myjetbrains.com/youtrack/issue/RH-29106
Unfortunately, I made a bad “fix” to the trimmed surface intersector just before this WIP was released. I fixed it earlier today. This now works.