1. new file
2. draw spline CP, 2deg, closed
3. save -> crash

Debug:    "RDwgServices::printErrorStackTrace: General modeling failure" 
Warning:  RDwgExporter::exportEntity: Exception occured. Entity NOT saved: 
 RSplineEntity(REntity(RObject(id: 23, document: "0xb246720", address: "0xb915f00", undone: 0), type: 23, layerId: 21, blockId: 22, lineweight: -1, linetypeId: 0, color: RColor(ByLayer) , drawOrder:  0 , selectionStatus:  false ) 
controlPoints (6): 0: RVector(14, 21, 0) 1: RVector(41, 25, 0) 2: RVector(41, 9, 0) 3: RVector(28, 4, 0) 4: RVector(14, 21, 0) 5: RVector(41, 25, 0) 
fitPoints (0): 
knots (7): 0: -1, 1: 0, 2: 1, 3: 2, 4: 3, 5: 4, 6: 5, )
Fatal:    ASSERT: "false" in file RDwgExporter.cpp, line 1234

Thread [1] 2066 (Suspended : Signal : SIGABRT:Aborted)	
	__kernel_vsyscall() at 0xffffe424	
	raise() at 0xb4f037ff	
	abort() at 0xb4f05140	
	RMainWindow::messageHandler() at RMainWindow.cpp:63 0x8e025a6	
	qt_message_output() at 0xb5357f65	
	0xb53581ab	
	qFatal() at 0xb53582c9	
	qt_assert() at 0xb5358355	
	RDwgExporter::exportEntity() at RDwgExporter.cpp:1,234 0x8cb754f	
	RExporter::exportEntities() at RExporter.cpp:408 0x8de5c96	
	<...more frames...>