In every view except Top, one of my objects is displaying the wrong texture; rather than the blue-tinted final version it's showing the grey one other objects in the same scene use. When I examine it in the texture editor, it shows the correct blue-tinted version, but in the view panes it's still grey. Any ideas what could cause this?

Try duplicating it, and undoing the duplicate. I have a similar problem and duplicating it seems to work.

Will try that. It seems now, though, that when I select a polygon it's highlighted a light grey instead of the usual red. Am I having some odd memory issues?

EDIT - Restarted my computer, and now it's fixed. So I guess the answer was yes.