Hi there,
Just to let you know that I was experiencing this problem, but the self-repair option outlined above worked, namely:
$ cd /path/to/GW2.app/Contents/MacOS
$ ./cider --use-dos-cwd C:Gw2 -- C:\\GW2\\GW2.exe -repair
By the by, I think it’s just fair to reiterate that unix is case sensitive, and you can press ‘tab’ to autocomplete paths in bash — so something like “cd /App <tab>/Guild <tab>/Con<tab>/Ma<tab>” is probably the quickest way to get it done.
Enjoy!