Logitech Setpoint: Front/Back buttons stop working

I have got a Logitech "MX Revolution" and a "MX 1000" mouse with Setpoint 3.30 installed (Vista 32 Bit).

After a while the front/back buttons stop working in DO's lister. This only appears in DO, the buttons still work in other apps (like Opera, Explorer,...).

It ran fine without Setpoint and a "MX 518" mouse before.

[How to: Make Logitech Mid/Back/Forward buttons work in Opus)

Yep, I knew there was a solution and I read this before but I didn't remember. Thanks.