Yes, the fix is pretty easy but you'll need to undo the nine screws securing the front of the magazine. Remove the black aperture plate and you'll see a flat piece of metal the is actually a spring at the top of the magazine. When it is not seated properly, the dark slide can't push the right side of this "spring" - this prevents the top locking button from moving completely. This piece is what prevents the magazine from being removed from the camera if the dark slide is left off the film magazine.
A secondary issue is the spring loaded metal piece at the bottom of the magazine (easily seen with the film aperture plate removed). When the dark slide is inserted in the magazine, the tiny opening to the lower-left is partially covered and the camera shutter cannot not be released. With the dark slide removed, that opening is fully exposed. When the shutter release is depressed, a small metal "bar" extends from the camera body into this opening before the shutter can be released, this bar has to enter the film magazine. Older non-"A" backs has this piece on the left edge of the film magazine. This prevents the camera from taking pictures when the dark slide is in the film magazine.
