Failed to draw layer, WMS

[Rob Sosnowski]

Hello all,

Have two WMS working within the mapfile - 3 layers in one, 4 in the
other.  Both WMS are called from another web app mapfile.  All layers are
in the same projection.

All layers will display, but occassionally a "MsDrawMap(): Failed to draw
layer named ..." error will occur.  The error has happened on nearly all
the layers, so it is not isolated to one layer.  The error can occur when
the app fisrt loads or when zooming in, etc - no pattern as to when it
occurs.

Any ideas of what may cause this....Rob