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We've been having strange issues with failures as well. When dealing with sheet metal assemblies, we are getting placement failures. There is nothing wrong with the placement. The sub-component has also regenerated properly. Our work-around was to suppress the feature during placement then unsurpress it when the failure mode is complete and ironically it works right away.
Here is the Creo 1.0 Icon on Windows 7 for those who have not seen this. Not sure why the exclamation but it bothers me.
"Too many people walk around like Clark Kent, because they don't realize they can Fly like Superman"