Silhouette Edge Problem

SW 2009 SP 3.0 Windows XP x64

We are having issues with silhouette edge selection. For someunknown reason, they suddenly become unselectable whencreating/editing sketches. Exiting the sketch and re-editing itwill bring the silhouette edges back to life.

It is also only certain edges. For example, there might be tenholes in a part. One will have unselectable silhouette edges, andthe other 9 will be fine.

Has anyone else seen this problem?

Jim S.

SolidworksParts And Features