-xc giving very little information

A complex program of mine fails with this message: Fail: Maybe.fromJust: Nothing I tried to extract more information about the error by compiling with -prof -auto-all and running the program with +RTS -xc, as advised on http://www.haskell.org/hawiki/TipsAndTricks . This yielded exactly one additional line: <Data.Maybe.CAF>. Fail: Maybe.fromJust: Nothing (Same result for GHC 6.0.1 and 6.2.) Is there another option I have to use to get a full stack trace? Or is my longing for stack traces a side-effect of writing too much Java code that I have to overcome? :) -Stefan