Friendly reminder (especially for new and potential users): Guild Wars 2 is still officially unsupported in Crossover.
Our staff is working hard to bring it to a more stable state, but for the time being our regular support staff will be unable to help you with GW2 issues. Everything we know is listed in the discussions on these forums.
Note that some users can get GW2 running with Crossover on their machines, but at present we cannot guarantee that it will work for everyone.