For those experiencing the "black screen" of a character loading.
The trick is to reset the character customizations. Although this part is known, the actual buttons in the character editor still work even though the screen is black.
Go to a character where you can see the buttons. Memorize their positions on your monitor. (Remember "Reset", where the "Yes" appears" when you click reset, and the "Save and Exit" position)
Then go to the character that makes your screen black.
Click those 3 positions in order, it will return you to your room, go back to the editor. No more black screen for the character.
Since this appears to be a common repeat occurrence with version transfers, maybe write/re-write/copy into the OP?