How did you edit your build.prop and did you make a nandroid beforehand?

 

They should, every time you flash a new rom it overwrites the build.prop. Every developer edits the main build.prop so that they can put their rom info in for the build info or to add other things. This is one of the things I've learned in my brief experience in rom development. There's one of two things I can think of to fix this. The first is just reflash your current rom. Try dirty flash the first time. If that doesn't work, then try to restore a nandroid or clean flash your current rom.

 

No problem. I find that using root explorer makes it pretty simple.

 

I realize this is old but for future reference you could/should go into recovery when it starts bootlooping, and try clearing cache, and davilk cache.
If that isnt enough to get it to boot go back into recovery and fix permissions, the copied build.prop may have not had the correct permissions.

 

yes thank goodness for nandroids, I have forgotten to make them on occasion and lost a few weeks/months worth of changes