My Hasselblad 501CM seems to be 'jammed'.

I used it a few weeks ago in dry weather. All seemed to be OK. On the way home, with the camera in my bag, the heavens opened and I got totally soaked - rining wet. However, though the bag was wet, the inside seemed dry as it has a membrane inside that seems to stop the wet. So I thought nothing more of it.

This morning, I loaded a new roll of film and tried to wind the the viewer. However, it wouldn't go forward. With the dark slide removed, I pressed the shutter and though it fully depresses, nothing happens and I cant wind the viewer on. I now cant remove the lens either, because, I assume, it think its locked between an exposure?

What might I have missed? What might I be doing wrong? Or is it proper jammed?