So I don't know if this has been discussed but the only way I have managed to get around the blackscreen so far is this. Now its really weird that this works but give it a try. I tried the IE explorer fix to no avail but for whatever reason this works. So each time I load up FFXIV I go into the config and change the screen resolution. For me since my max is 1440x900 I switch to 1280x800. If I exit I reload the config and change it back to 1440x900. So every time I quit and want to play again I just change the resolution in the settings. Seems strange but has worked for me so far.