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Editing build.xml - even edits to comments - causes netbeans to hang.
Created attachment 24273 [details] Log from session that hung
Log file is useless. Need a thread dump. There was a serious bug in XML editing (not Ant specific) which caused freezes, which was recently reported and I think fixed. So get the next dev build and file a new issue with a thread dump if you see it again.
I'm happy it works for you. The build I'm using is 200508241800. How recently was this fixed?
Last few days, I don't remember. As I say, try with the next build and file bugs with thread dumps if you find a freeze.