Is this pedal an old one you haven't used for some time? Was thinking there "could" be a bit of corrosion leading to iffy/intermittent contact, hence all sorts of confusion. Might be worth checking the switch, working it a few times, or even cleaning contacts if you can get to them.
Also check for dodgy cable/connections.

John

[This message has been edited by jwyvern (edited 08-10-2007).]