Sorry, I didn't notice the PM until now. I didn't receive an email telling me that I'd received a PM here for some reason.
If you're referring to getting a blank screen after registering, that sounds like a problem with the GD module. The only way to be certain is to register again, then check the Apache error logs to see what turns up there. It'll most likely tell you that either GD or GD::SecurityImage aren't installed. Do you have access to the logs?
