The Mac version of POTCO doesn't have the Graphics Options on the launcher as DirectX is Windows only. Try emptying out its cache folder as found in
this thread.
Quote:
To delete the contents of your Pirates Online cache folder, complete the following:
- Go to the location where you installed Pirates. The default location is the Desktop
- While holding down the Control key, click on the Icon
- Select Show Package Contents
- Click on Contents | MacOS | cache
- Select All of the items inside the cache folder and choose Delete
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