from an email someone send to me:

"I'm inclined to doubt that the jammed canopy was due to a software
problem. Still, it's not impossible...I'm wondering why they didn't
just have the pilot blow the canopy. It
should be possible to do that w/o triggering the ejection seat,
shouldn't it? It seems to me that that would have caused less damage
overall, especially if they tethered the canopy to an overhead crane
first (suction cups? A few drilled holes? The canopy was probably a
write-off, anyway). Speaking of which, does anyone know if the F-22
uses a 'jetison' style canopy for ejection situations, or a
'glass-shatter' type system like the Tornado?"

Mike