On Land

Environment Information
At Rill Architects we run ArchiCAD on macOS. If you work at Rill, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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If it hasn't already, your Software Update will soon offer you to update to OS X 10.3.9. You can go ahead and do this.

The only possible glitch I have heard of is Java apps misbehaving in Safari, or Safari failing to launch. If you observe any weirdness in Safari, re-install the "2005-002" security update. It is available at 3 Resources : Mac OS Files : SecUpd2005-002Pan.pkg. Apple has a page on the issue.

Incidentally, this is likely the last update to Panther before OS X 10.4 ("Tiger") is released at the end of the month. That is a major update and we will handle it as wait-and-see.