Try scanning from the image software you are using, not from the front panel buttons. Go to the TWAIN options and make sure your scanner is selected, then go to Acquire and the scanner software will start. Scan from there without using the scanner front panel.
Actually, I contacted Lexmark and got the problem fixed. Turns out, the firewall was blocking it for some reason, and all I had to do was configure it to allow the all-in-one center and the other programs. posting this up here in case others have the same problems. =]
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