About how long ago do you think this change in Polly-o might have happened? I go through a 2lb block in about 6-8 weeks. Last week, I finished off a block and after reading this thread, figured that my palate wasn't as sophisticated as many of the rest of you, but I hadn't noticed a difference.
Yesterday, I bought a new 2lb block at Sam's Club and made a pizza. It was a very disappointing effort, but I'd made a few changes, so I didn't know if I should blame the cheese. But I did notice that it was visually different. After cooking, the cheese seemed browner and a bit dull (not as shiny). It also tasted inferior, but I didn't know if I should blame that on my experiment with a different flour.
And so far, I haven't been able to find Grande within an hour's drive from home.