When selecting 'edit' on a procedural item (2d or 3d texture, or procedural material) Procedure editor window is created, but then loses focus. I believe (based on window layering, ie what is on top of what) that focus returns to the main scene window, which then passes it back to the texture/material dialog. This dialog definitely has focus. (It traps key events)
In case it helps: I am on windows vista, 32 bit, running on sun java 1.6.0_11
The command window is on the bottom of the window stack after this happens. (I start AOI with a batch file) (I think this means that this window never receives focus)
Any questions, just ask, & thanks for the great program!