I have a feeling this is related to the bug which involved pressing Right Arrow twice to move the cursor at all. But I'm not a programmer, so that may not mean much. :P
Bug 2101: Any character followed by Right Arrow moves the cursor to the next cell Description: When typing in a cell, if Space is pressed, followed by Right Arrow, the cursor is moved to the next right-hand cell (or the first cell of the next line) rather than to the right of the next character. NB. I have just noticed that it is any character, not just a Space. Cheers, Dan