I have seen a couple of references to this problem and I experienced it on mine in Bonaire.
First, on another forum, Ike indicated that they have isolated a problem and have a fix. I'm sending mine in soon.
Second, there are multiple chambers in the viewfinder, but the water will eventually migrate to the inside of the housing, so be cautious if it starts fogging or leaking. I took mine apart in Bonaire, cleaned and lubed the o-rings, and got it to stop leaking for the remainder of the trip. It's a pain to reassemble, but can be done.