I had been lurking for a few years before I started being active, and then I rushed to get the required 25 posts for a name change, so I never had that problem... but I could definitely see how it could be.
Well, I guess give it some time and float around, respond to posts or something, maybe even try to join an RP and you'll get out of Probationary status in no time
It's an obnoxious step, but it's probably for the best we have something like that