Wineskin on OS X El Capitan
Wineskin does not currently work correctly on El Capitan. The issue is being looked into, but I have no ETA for a fix. I'll get a fix out as soon as I can.
Some people have been able to upgrade to the latest version of XQuartz, and change their wrappers to use XQuartz and not WineskinX11 and have gotten wrappers to work, but this method has not worked for everyone.
Please add to the discussion here if you are helping find a solution.