In an earlier post, someone commented that the Metol version of Rodinal that Patrick had brought up some time back does not appear to have long shelf life.
This has been bothering me for 2 reasons. Metol is a very close relative to pAP. It should keep better as it is a less powerful reducing agent IIRC or less strong base in any event. Also, its properties with Sulfite are quite different than HQ and more like pAP. So, if it keeps poorly something else is going on here that might give clues to Rodinal.