Default Export Location

I have the weirdest problem develope, where every time I export a file it's first stop is one particular client's dropbox folder.  No matter which folder I exported to last, it keeps defaulting to this one folder.  Some of my presets have "choose folder on export" -- and it always defaults to this same folder.  I've been looking all through the pref's for why this might be but haven't come up with a thing.  Anyone got an idea?