callback parameters messed up

[Eric Bourque <ericb computer org>]

I've got a button callback which is consistently giving the gpointer
data in the widget field, and vice versa. This is code that worked fine
with 1.0.6, and I have just upgraded to 1.3.0. I have checked that I am
setting things correctly using gdb, but the callback parameter list is
consistently mixed up. Any ideas?

Eric