Got 2 of them from Meffert today and had no trouble thanks to your suggestions here swapping out the pieces. I even sliced some of the tiles and rearranged them so each color has a front and back. And it's BIG! Big enough to solve without cramps in my hands. Now I can finish the little 8-color one with the Swkeb Diamond Tiles I bought. These look so great I may never put them on eBay.
Sorry, just wanted to share.