I was able to catch the output from the Debug build for the problem tile. It
hangs in the middle of a layer rendering. Here's the last lines from the
log:

start layer processing : rails_air
datasource = 0x1997f60
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
end layer processing
start layer processing : tracks
datasource = 0x19c46d0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0
borrow 0x18d56e0
return 0x18d56e0

The end layer message for "tracks" never comes. The layer renders properly
for 99% of tiles, only in some areas there's a problem.

What sort of dynamic data could cause this?
How can I continue debugging from here?

bye
              Nop

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