black map. only works underground mode.
http://i.imgur.com/uQylvW6.png
how to fix?

delete the config files.
(MapWriter.cfg, MapWriterBlockColourOverrides.txt, MapWriterBlockColours.txt)
see if there is a error in the logs relating to mapwriter

@Vectron I tried to remove all. does not help...

could you send me your log file?

looks like map breaks down what the second mod...I'll look for it
find the mod, send the log and the mod name..

log
https://gist.github.com/a56da6da3019681172549cdf9bf28f1f
it seems to conflict with this mod
NotEnoughIDs-1.4.3
https://github.com/fewizz/NotEnoughIDs/issues/35#issuecomment-185184054

i found the problem and will work on a fix.

Any updates on this? I've got the same problem and can confirm it isn't a compatibility issue with NotEnoughIDs (don't have it installed). Not sure if it's stuck in underground mode because my underground mode seems to work fine. Normal mode was drawing over my old map with black, effectively erasing it as I moved around.

Tried reinstalling the mod, removing the config files and putting them back in the new installation, as well as removing and replacing the mapwriter folder in the world's save folder. Then used M then R to regenerate, which adds a few green pixels in the black space being drawn over the pre-existing map when on an island in the middle of an ocean. That got it to render grass it seems, at least.

Island/ocean: https://gyazo.com/d9de47cd62efa1bf0a83bc2d7f4a1a1a

Base after deleting and reinstalling everything (brown for grass from before the malfunction, original black patch apparently drawn over with grass after regeneration): https://gyazo.com/c42c66f25c025f5e7e3623e1990a7062