Exactly. If the fascia is too tight, the fascia's slightly beveled button holes will lock the button down in place. Once the buttons and fascia are clean (and the lens is not hitting the buttons), unscrewing the left top and left bottom fascia screws by a quarter to half turn should do it.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set