Had discussed this one with Brian some time back but it appeared I was the only one having this problem at the time. For me it happened back around version 2.41 when I upgraded the shuttle plugin to get the custom macro options.
Mostly the rapid ++ & rapid -- will intermittely act as a toggle switch and I usually have to push a button 2 & 3 times or hold it down to get it to take.
I have a 2nd machine with a shuttle using the older version of the plugin and have no problems, switching the shuttle or reverting back to the older plugin does not correct it nor does a clean install.
Must say is makes the ticker miss a beat when you rapid down the table at 750ipm and 20" from the end of the table you take your finger off the button and it keeps goingÂ