The attached test01.dxf cause ver 2rc2 to crash (windows 7, x64).
The same file previews ok on ver 1.0.3
pushed a fix in master, commit 2879aff
I noticed an equation solver bug. causing ellipse not being drawn sometimes.
This is the worst bug to expect, we may try to fix it, or switch to an advanced equation solver for 2.1
workaround for ellipse drawing bug in master: commit ada867e0