This may sound frivolous but has anyone had problems with the little rubber skids on the bottom of the powerbook. I have a 12" PB and I definately do not abuse it but those little rubber skids almost immediately popped off of both of the batteries that I own. And now one of them has popped off one of the corners of my computer. The computer now easily slides on one side and makes an annoying scratching sound depending on what surface I have it on. I tried a dab of superglue but to no avail. Any suggestions?