I've not yet heard about the index error, if you get it again, I'd like to hear the exact error message if possible.
Did you already set a file path in the options (easiest by using "browse" from the menu after selecting the file path item). It should give a nicer error message, if that's the cause. Could you try that and report back please?
Regarding the negative coordinates: Coordinates west of the prime meridian are shown by a "W" suffix instead of a "E". This is the common convention, AFAIK.
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