Good point, I should add that to the installation instructions for people like you using more than one language version.
If you want to use ProfitUI with your Japanese installation, please extract into
..\SONY\EVERQUEST II\LP_REGION_JA_JP
If you want to use it with your US English installation extract into the
..\SONY\EVERQUEST II\
EQ2Map needs to update the ProfitUI folder. If you use both language version, you'll need to install it for each one separately (just as ProfitUI).
Hope this helps.