Dear Dean Rie and team,
I restored an older Cursor backup, including both USER/.cursor and USER/Library/Application Support/Cursor, but the issue persists. It seems likely related to a recent update at your side.
Please let me know if there are plans to address this or if there is a way to manually alter the chat window settings. I would really appreciate being able to use custom syntax highlighting again. Now it’s hard to use, since some colors are hard to distinguish on a white background in chat (see below) 
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Warm regards & hope to hear,
Jeroen