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Nowadays, $orientation is mainly used when viewing a game, just in case you find side-flipping on each move disorienting and would like to view a game from a fixed perspective. It can be set in a preset or settings file with the use of GAME Code. It may also have a legitimate use in fairy chess problems, but it looks like the code for handling them needs to be overhauled.

That's now fixed. The settings file was an old one with some obsolete settings. It had $orientation set to "White", but setting this variable is no longer allowed when creating a new preset. I changed its value to "auto", which is the default. I'm now going to look into how I still use this variable.