We've migrated to IDEA 10.0.0.1 from IDEA 9 (Community edition), where we've used an extended Ant (with ant-contrib, svn-ant, and nsis-ant).
Although we've configured IDEA 10 (made our ant the project's default and added the jars to the classpath), the Ant Build view shows the targets in gray and when we execute one (e.g. double-click) it ends as if run successfully after 0 seconds.
(We're running them from the command line successfully, but manually :( )
found a similar complaint in a discussion.
thanks, asaf :-)