I'm having a weird problem getting my CSS Sprites to work and stay working. GTMetrix gave me a rating of an "F", so I got everything I needed for the sprites from Spriteme.org.
Basically even after modifying my style.css file, the site still pulls from the old images. I even replaced all the image locations in my style sheet to point to the new sprite image.
Even weirder, one minute after updating everything and resetting caches, GTMetrix notes the use of sprites and gives me an "A" rating. If I run the test again two minutes later, I'm back to an "F", being told that the sprite is not being used.
Honestly I have no clue what's going on here, and I don't even know how to describe it. If anyone can help me, I'd appreciate it.