It could be one of two things. A lot of phrags, especially the long-petalled types (Court Jester has a long-petalled species as one parent, if I'm not mistaken), will have a little bit of this sticky brownish stuff at the leaf base. It seems to be increased with high light levels and temps. It does *not* smell foul.
The other brownish substance is the dreaded basal rot. It is watery, spotty, and very very ugly. It also stinks, and once you smell it once, you will know what it is.
It sounds like you have the former, harmless brown stuff. Basal rot is usually not detected incidentally--the typical picture is the orchid grower seeing it and freaking out.