Import map does not work
Windows 8.1 64 bit, 8 Gm RAM, Intel(R) Core(TM) I7-4500 CPU1.80 GHz 2.40 GHz GPU: AMD Radeon R7 M265, Intel(R) HD Graphics Family. Version game fresh, 1.3.1f5
I go into the map editor, choose "import" in all three tabs - empty. Please fix it.
output_log.txt.War for the Overworld Launcher Log.txt
Took a quick look at the Output log, looks like one (or more) of the workshop maps downloaded has thrown an exception due to missing/corrupted meta file
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The map Prima Cairos seems to be causing the issues, try unsubscribing from it then re-verifying your steam cache, see if that fixes it by removing the problem map.
In the mean time i'll ask one of the coders to take a look at your log, they'll understand the meaning of the error better than I do.