I have little experience in Java/Groovy/Grails, about 1 year using Eclipse and some weeks using GGTS, and I always got my projects with build path problems, or other related problems, with apparently no reason. The environment seems to be buggy. Any tip?
Below there's an screenshot of a project I was working on and, after a computer restart, a lot of wild build path problems had appeared.

PS.: To solve these problems I closed the project in GGTS, used a grails clean in console, opened the project again (all the problems still were there), then I just gave a look into properties > Java Build Path and all problems have gone. These steps makes no sense for me.
Like others I would not recommend Eclipse. All variants(sts,ggts,vanilla eclipse+plugins) are unstable at least on Juno, IMHO.
I personally use emacs, but like @James, I would suggest IntelliJ:
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