Since coming out of beta I think they have been deluged with applicants. I'd be patient and give em another few days. After that I'd just attempt to register again. maybe that will even generate an error saying your first attempt is being processed. If not then maybe it will break the logjam.
Once you get in, please please please carefully consider your submissions. A fairly new feature allows members to vote YES or NO on submissions and the quality of most submissions is pretty bad. Myself (and many others here at PF) will readily admit that we vote YES on maybe 10% of the photos being submitted. Of course, the members are not the final vote but I'd imagine that the ones that get a lot of NO votes are dismissed fairly quickly by the official judges. Now, I'm sure that the submitters think they are fine but come on, if a photo is out of focus and overexposed (or whatever) then the "photographer" knows in his heart of hearts that it's not good enough for the flagship gallery of Pentax photography.
Unfortunately of course, some photos which do deserve to get in don't for some reason or other. There are many threads here at PF that contain gallery rejects, many of which would have gotten my confident YES vote, but art being what it is what I see and what the final judges see may be two different things. Take your rejects in stride and appreciate your successes.
Best wishes with your entries...
Mike