Some interior tiles don't render

Question

I am rendering multipolygons of FEMA flood zones using mapserver / mapcache / openlayers.  The flood zones render correctly directly from mapserver, but at a few zoom levels interior tiles (by which I mean tiles inside the multipolygons which contain no edges) are rending grey.  The odd thing is that when I zoom in further they display correctly again.  I'm attaching links to config & an example of missing tiles.

mapcache.xml
floodbroker.map
image of missing tiles

maeneak · Answer

So I had a similar problem getting 500 responses for some tiles but mine was with a LINE layer that I was drawing labels on. Ended up being a clipping error and adding PROCESSING "LABEL_NO_CLIP=True" to the layer definition cured my ills. I would suggest clipping is the main culprit here and to check tile_map_edge_buffer and tile_metatile_levelsettings for possible issues.
Best I can tell my labels were drawing outside the tile boundaries and causing internal errors in mapserv.exe

Some interior tiles don't render

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