Just to check the obvious . . . You have three trays, in the dev tray is a pair of tongs which doesn't go in any other tray, and then one (or two) pair for stop and fix, which never go near the dev?
In other words be very sure you are not accidentally putting a drip of stop-bath in to the developer by not washing a single pair of tongs, or by using a gloved hand which is not cleaned only wiped on a paper-towel, or a splash of stop-bath is made in to the adjacent dev tray when you drain the print prior to moving it to the fix . . . and so on!
Last edited by MartinP; 12-08-2012 at 04:07 PM. Click to view previous post history.