it seams to me that starting with EE2007.3 some little problems comes up usign interactive plow.
I was not able yet to discover how to reproduce them but:
1 - Sometimes I'm not able to delete a semifixed trace. I must select other traces and then reselect the original one and delete it.
2 - Sometimes I'm unable to start plow from a pad. No chance. As before, I must select other pads and then retray.
Never had these problems with previous version.