new Q2612A cartridge impedes paper

Hi,

Everything works fine on my HP 1018 LaserJet which uses a Q2612A toner cartridge, but upon buying a new cartrisdge and replacing the old one, I now get a paper jam. Basically, the paper doesn't come up properly, get stuck half way, around the place where it touches the catridge. I did shake the new cartridge a little, and have pulled out the plastic strip.

I've checked it three times now, making doubly sure the cartridges is in place: but each time the old cartridge lets the paper come up and the new one causes it to jam.

So, as the old cartridge works fine, it's clearly a problem with imprecision in the casing of the new cartridge. It is the right model, I have verified, and visually they look exactly the same, although I notice some very small variations on the new cartridge, which shouldn't make a difference really,

I have never ever had this problem, especially with HP.

I am not in love with sending it back, which is a bit of pain. Have other people ever come across this problem of imprecise cartridge casings from HP? Outside of sending it back, what other solutions are there?

Comments, suggestions, appreciated. Cheers.