I'm with CeCe, if you havn't bought it that long ago then definatley take it back...if it's been over six months you may have a problem though, but you might want to check some consumer rights websites before you go to make sure you are armed with some good information!

I use both the Prep and Prime and the Studio Fix liquid and have never had any problems...mind you the Prep and Prime doesn't lasty long with me, but I can usually eek a good 9-12 months out of the foundation!

Also check where you have been storing it...things like it isn't on top of a radiator or on a shelf in direct sunlight etc.

Best of luck!

xxxVxxx