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Sketch relationships are not recognized


Hello everyone,


Using SE (ST4) happens to me a strange thing.

When I edited a sketch the relationships inside it are not recognized, are shown but if I try to select them (or delete them) they are not selectable.

If I delete a line, or use the command "update sketch" all comes back to normal, but if I close and reopen the file the "strange thing" come back.


I updated the video card driver and last MP


Have you ever seen a situation like that???
What's the causes???