Update: all efforts to unwarp the mat have failed. I had ordered it via Amazon.ca, but I think it was either damaged in storage by a third party (stored rolled in high heat environment??), in shipping, or perhaps was a return that was resold? No idea. I have returned the mat. Thank goodness for Amazon's return policy. I have not had to use it often but this was one time it was needed.
My original MegaMat arrived with no warping once unrolled, so it seemed "off" that this one was giving so much trouble.
I have now ordered directly from Quilters Rule as they should know better than anyone how to store and ship these lovely mats.
Last edited by WesternWilson; 06-27-2023 at 10:25 AM.