I have a recurring problem applying fill or a hatch pattern to polygons. If I draw a shape with connecting lines or with a polygon tools, and then try to apply a fill, about 95% of the time I get a message saying "valid hatch region not found". "Hatch Region" does not appear in the manual, and I'm unable to find any consistent means of dealing with this. I've tried closing any possible gaps in the surface. That seems to work about 10% of the time, but usually it doesn't. Sometimes I go back to a place where that message appeared, and the fill tool will work as expected.
This has been going on for months if not year, in TC Mac Deluxe 9 and 10. Any suggestions on where to start to get this working consistently are appreciated. Also, some definition of what makes a valid hatch region would be a good thing to put in the manual.
A possibly related problem is the ability to turn a 2D shape into a 3D shape. E.g. draw a square, tilt it in 3D and apply the push pull tool. Sometimes it drags the surface and makes a cube, but usually it doesn't. Same with the Extrude tool, which works more often, but not consistently. Typing in the axis and amount of extrusion usually works, but again not always.
My suspicion is that this is related to gaps in curves, and I noticed that V10 is supposed to have a gap closing function. I tried that on a trial version before updating from V9 to 10, but now can't find any sign of this function.