My AI covers stopped working after I pointed OpenAI at another server. How do I fix it?

Covers are always made by OpenAI itself, whatever your writing engine is. When your OpenAI engine uses another server's address, its key is not an OpenAI key, so it is not used for covers. From version 1.9.16 open Settings, "Extra tools", "Covers", paste an OpenAI key in "OpenAI key for covers" and click Save. If your OpenAI engine uses the official OpenAI address, its key is used for covers too and that field can stay empty. Without any OpenAI key, covers fall back to your free Gemini key.