This is why I haven't upgraded my OS since Yosemite, in case further upgrades broke the wrapper for NWN, but it forced me to update to Yosemite and thankfully it still worked.
You may want to check the Codeweavers website to see if they've updated their wrappers for Crossover, if you are willing to fork over money for the software. There's also the Wineskins that doh123 put together, but if the Paul the Tall one didn't work, this may have the same issue. Link is
here in any case.
Someone will make it work eventually, it'll just be a case of waiting, I suppose.
Sorry I can't be of more help!