Never used Nextheme so no clue BUT... I found this odd... I installed a project and it didnt work (happens) and when I put my backup back on, no signal.. nothing. Even though I made it about 20 minutes earlier and all was well. I had to install PE again and then install my theme again (red glass). No idea why it happened but... it did.
Point is.. maybe try installing PE again and then nextheme again?
If it makes you feel any better, when i flashed the nextheme, signal was nonexistent and i had to reinstall PE as well. I like the theme though.