I am new to Blender (using it for about a month) and have no prior experience using 3D animation software. I thought I’d have a go at the Robot model in the new Blender on-line PDF magazine and got stumped far too quickly…

Below is a descriptive version of my problem. However the long and short is this… sometimes Alt-J works (to convert triangles into quads) and sometimes it doesn’t. What gives?

I have a UVsphere, remove 2 adjacent vertices to make a square hole, then take the 3 vertices at each corner and press F to then give me 6 sides total. I take the inner 2 vertices of each of the new edges and subdivide (w>subdivide). I then get 2 triangles which I want to convert to a single quad. I select all 4 vertices and press Alt-J and sometimes it works, and sometimes it does not, even when I am pressing the same buttons in the same order for each of the corners. It appears to work for some edges all of the time and others none of the time. What gives? I am using a decent mac (imac G5) if that makes any difference.

Any help appreciated. Thanks