ayce, the WPS parser is now strickter, it will not run a theme if there are errors in it. For example unclosed conditionals.
before this would be ok
%?it<%it|
it would show the title and then nothing if there was no title, but now since there is no > at the end the wps parser throws an error.
You can debug wps's with the simulator by doing this through the command line
rockboxui.exe --debugwps
rasher's rockbox site has some simulators of the standard build you can use. If all else fails, I could offer my help, pm me with the .wps and I can debug it for you.
Also, if you haven't read the thread about licensing, I'd suggest that you license your theme. I think Creative Commons by Share Alike 3.0 is good, but you can choose any license you want.
thanks
