Quote Originally Posted by MattKing View Post
Any chance you developed an unexposed roll?

If so your other, exposed roll is hiding somewhere .

Do you know if the problem free roll was exposed first or second?

Is there any chance the darkslide was in part way - enough to block the light but not enough to engage the interlock?

Did you have the mirror lock-up set to on on the lenses?
This covers everything I can think of...

What camera model is it? RB67 Pro, RB67 ProS, or RB67 ProSD?

Frustrating! Hope you can get it figured out.