Gnucash How get I rid of strange unreadable characters

I installed Gnucash on my Mac OS X El Capitan, but I'm having problems with titles and headings on the interface and reports.

By following the advice on here

https://wiki.gnucash.org/wiki/FAQ#Q:_How_get_I_rid_of_strange_unreadable_characters_or_adjust_the_font_size

I've managed to get rid of the problem on the interface and the headings on reports, but the problem still affects the titles of reports (see image below). Instead of getting the title Income Statement for ..., etc, I get a long list of numbers. Income Statement Report

Regarding advice below (from the Gnucash wiki page)

MacOs: Create a plain text file in your home folder (~ is unix shorthand for your home folder): X Window version: ~/.gtkrc-2.0 native version: ~/.gtkrc-2.0.gnucash

I'm not a computer whizz, in fact I'm quite hopeless. I don't really understand where the home folder is or what the difference between X Window version and native version is.

Hope I explained my problem adequately. Any help really appreciated. Thanks in advance.

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