I think I finaly solved the problem, just leave hardware acceleration ON but fast reponse OFF.

NO more problems for more than a week!

Thank you all.

No clue as to why is Aiport the culprit, but I found this hint online and tried it, and seems to work!

Disabling airport for some minutes before opening SU solves the problem. After a while I can activate airport again, and continue working.

Tried to use little snitch to block SU, but not sure if it works or not.

Not sure but this problem seems to be mainly on old files, on those created on OS 10.4, new ones don't seem to be afected.

Anyone with simmilar issues?

Still having the same problem here!
OSx 10.5.4 ans sketchup pro.

Sketchups hangs when rotating a model.

The patch was no help at all, so far, If I disable airport, the problem disapears, no clue what this is!!