I discovered this after getting frustrated of not having a switchback button when playing CS with my MX1000. This resolves the stubborn undetected thumb buttons (forward and back buttons) issue with this great mouse.
Open the Logitch Setpoint software and assign buttons 7 and 8 the Other option. A sub menu should open and let you select different assignments. Select Generic Button for both.
Result: The Thumb buttons are now recognized as mouse 4 and 5, are recognized in games and retain thier forward and back capabilities as well. 3 birds killed with 1 stone
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Open the Logitch Setpoint software and assign buttons 7 and 8 the Other option. A sub menu should open and let you select different assignments. Select Generic Button for both.
Result: The Thumb buttons are now recognized as mouse 4 and 5, are recognized in games and retain thier forward and back capabilities as well. 3 birds killed with 1 stone