Hi Phil, I have not heard of those bugs before, if they happen with a particular file can you please send the file to me at moi@moi3d.com so I can reproduce the problem over here and look at what's going on with it?

> I also knoticed a bug while trying to extrude. At one point it extruded but once I
> click to set the Extrusion it dissapears.

It's possible to get things similar to that if you have snap turned on and when you go to click you move the mouse slightly in such a way that it snaps on to a point that is at a 0 elevation from the extrusion base point.

Snapping works in combination with Extrusion so that you can snap onto some existing object and produce an object of that same height, see here for an example:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2553.2

If that's what is happening to you can turn off Object snap on the bottom toolbar while doing the extrusion or hold down the Alt key which will suppress snaps just while it is held down.

But if you have any examples you can send that would help to verify whether it's the snapping feature that I described here or a bug. It's really hard for me to say one way or the other without seeing the actual file and going through the same steps over here.

- Michael