Please read this completely! If this doesn’t work, let me know and I’ll post the complete steps in best logical order. (if this doesn’t work, please reply with your complete system specs… Most importantly CPU, GPU, ram)
You can try to delete the contents of the gw2 data folder, it’s a pain to get to the right one: this step is a general fix for many tp and graphics issues, even without the previous steps however, it will lose all saved login/password and in-game settings.
Mine is located under the hidden Library folder (navigate using finder, do not use spotlight to search)
/[yourharddrivename]/users/[yourusername]/library/application support/guild wars 2
You may want to copy/paste this folder to your desktop as a temporary back up, just in case.
Delete the contents of that specific folder (you should see files like this contained within “config, dyndata.dat, user.reg, userdef.reg, and folders p_drive and wineserver…namestuff…loca..[long name]” just to list a few), then re-run the client..
~~Your folder is probably hidden (as is the default). Hidden folders display as greyed out text and icons. I found this after googling:
http://m.wikihow.com/See-Hidden-Folders-on-Mac-OS-X-and-Other-Recent-Models
You can also try holding alt while clicking "GO " in the finder menu bar unhide the correct Library folder, continue holding alt and click on Library (if you release the alt/option key, “library” will disappear. At least the link has visuals for you. Hope it helps.
