ok, I got rid of the tail - it's the file data/Menu/Gui/ContLine.tga (thanks to Rubini for finding out everything about this file)
If making it transparent, all the tails are gone. That's a very pleasant effect, now all the tails of opportunity contacts are gone too. So you only get the general direction e.g. WSW and no more exact course as indicated by the tail. good thing!
BTW I use GWX 1.03. In NYGM 2.5 the modders may have eliminated the tail right away.
no need to look into it further, problem solved
