1. Font conflicts; specifically Helvetica and Courier. I have Suitcase installed and my Postscript fonts are what is conflicting with the System fonts.
2. Safari is becoming a hog. Noticed my system was slowing down so I check the Process Viewer. Safari was taking up 189 mb of RAM, with only one window open and no tabs open. Quit Safari and system sped back up. I have 896 mb of RAM installed, so that shouldn't be too much of a problem with virtual memory swaps. The only other programs active at that time were Illustrator and Photoshop which were both using less than 80 mb of RAM. If a web browser is using more memory than Photoshop, then something isn't right.
3. Save a new file to a folder and it doesn't appear in a program's dialog box when trying to open the file in a different program. Yes, the file is viewable by both programs. If I switch the view from list to panes and back again, the new files will finally show up.
4. Junk mail filter stopped working after a month in Panther. Can't figure out why; didn't change any settings at all.
5. In Sherlock, when I launch it, it doesn't automatically highlight the box to type in my search word. It does work sometimes, sometimes not. Plus, when it doesn't not highlight the search box, I can't tab over to force it to highlight the box.
6. This might not be Panther, just some corruption, but it doesn't shutdown from the Shutdown command in the Apple pulldown menu. I usually have to force it to shutdown via the Terminal.
This was a complete install of Panther on a G4/867 w/896 mb RAM.