Increase in BW is expected for increase in Users/registrations; keep in mind that just because you haven't recieved more registrations doesn't mean you haven't recieved more users...

You should look into installing some sort of statistics program to monitor things.

Also, you should look at a VPS if you're pulling such large ammounts of bandwidth, $40/mo will likely be cheaper than your bw overages with your host.

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
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