I started experiencing the exact same issue from this thread:
http://ellislab.com/forums/viewthread/52713/
I’m using a Mac just as the poster in the thread above was. I have no idea if it’s some weird network issue or an EngineHosting issue? Seems like maybe an EngineHosting issue (going to shoot them an email too) as other sites seem to load fine, but mine on EH were dragging, but not really sure.
I’ve experienced this twice tonight and after a lot of trying I finally got the template to save correctly so I’m just going to leave it alone and try it in the morning. Don’t want to break it again.
Any ideas?