Update
I've just answered all my PMs. If it takes longer than 10 seconds to get the keywords the first time you run it, close it and reopen it, it will work faster. We're fixing that bug now.
Note: The domain checker is actually working, but sometimes you may not notice it if none of the domains are available, because we have not configured it to add a X if its unavailable. So far, it will add a check if it is available.