There has been a weird bug surfacing lately in the carts, mousewheel and treadmill from Marine's Goodies : sometimes when an avatar sits on a prim that was used by someone else just before, it would not trigger the animation. Worse, it would trigger it on the last avatar if they were still in the sim !
It did not do that before, I wonder why it does now. Anyway, after much testing at Stones'N'Rubber (with the help of Sinha Hynes who showed me the bug in the first place) and Bondage City, and after much hair-pulling at home, here is a new version of the script that fixes this issue.
Since the Mousewheel, the Treadmill and the three carts from Marine's Goodies all share the same scripts, they all had the same bug and therefore all need the same fix. That's why you will need to update them all if you want to get rid of that bug.
To update, simply click on your device (mousewheel, treadmill or carts), go to "Maintenance..." then select "New version ?". You should receive your updated box shortly after. Of course, you can only do that if you are the owner of the device.
Have fun !