On the PostgreSQL (9.3.0) + postGIS (2.1.0) side, I'm receiving the following WARNING log:
CONTEXT: SQL function "st_force_2d" during startup
WARNING: ST_Force_2d signature was deprecated in 2.1.0. Please use ST_Force2D
I found that the reason is the mapserver (6.2.1) layer used in the mapfile quering postgis data.
Do you know if in mapserver 6.4.0 (just released a week ago) the issue is resolved?
It was not addressed in 6.4.0. Opening an issue on the MapServer issue tracker would be a good start to get this added into a future release.