I am using Maple 13.02, build 436951 on 32-bit Vista. I made the last attachment with only the keyboard, not palettes.
I don't like 1D math or the classical interface because it looks ugly and does not support atomic subscripts.
Yes, 2D seems to hide a lot of things. I cannot determine why some entries go nuclear on me (atomic) and other don't. See below.
I think I have a work around. I select and copy the expression that is giving me grief to a open spot on the worksheet. Then I do a left mouse click and convert it to 1D. If it shows items like "#mfrac" and "linethickness", then I know that the expression is hosed up, and I need to reenter it again.