OK y'all, I need some help. Ever since I've installed the standard size chainring (and installed a longer chain with 100 links) I've had trouble with the chain falling off the chainring when unfolding "briskly". That is, unfolding fast in one motion. This doesn't happen every time, but probably about 2/3rds of the time. The B never did that with the original (reduced) chainring. Any ideas?
Al from Portapedal said that I might be a tired (worn) chain tensioner and is going to be sending me one to see if it helps.