I have a couple older 510 attys that don't fit the prodigy. That's fine by me; they were old and on the way towards to garbage can anyhow. In the mean time, my 3 month-old Janty 510 atomizer is still going strong (I don't know how though).
As far as I know, it's a known issue, but since there are various manufactures, it's impossible to guarantee compatibility with all of the slight variations among the atomizer types.
What type of atomizer are you using on your prodigy?