Ok now I am going to be a pain. I kept reproducing the same results. I was just messing around with the ROM not the apk trying to get it to work.
Then I flashed another ROM and it is working. There is no picture for the preview but there is a blank tile and it applies fine. It was a ROM issue. A confusing one since other themes were working fine but it seems ok now.
Sorry to be such a pain homie!
Same here actually. I like the changer and all. But by the time you switch themes, use metamorph or zipthemer for the lockscreen and some other parts, then reboot, youre really not saving all that much time. And I know I dont have to do the whole MM step but I really dont like it when the lockscreen isnt themed, it just makes the whole theme look incomplete IMO.