I have an Epson V300 scanner, which was working fine in Windows 8x64. After upgrading to Windows 8.1, when I click on Epson Scan, I see the Epson splash screen and the Epson icon in my system tray, but the program isn't visible. If I right click on the Epson icon, I see a blank page. If I press the scan button on the scanner, a page will scan on default settings and appear in my Pictures folder, but I have no control over the settings. I tried uninstalling Epson Scan and reinstalling it following the instructions on the Epson website, but that had no effect. I also tried booting in Safe Mode, but I had the same problem in Safe Mode. I don't recall having had any trouble with this scanner when I moved from Vista SP2 to Windows 7 and from Windows 7 to Windows 8. Thus far, I have not encountered any other serious problem with the 8.1 upgrade.