I'm afraid I agree. Bright red has a long history of warning. It makes me feel I've done something wrong. Maybe just flash between normal and background colour?

On 12 Oct 2012, at 05:06, jamshark70 wrote:

The blood-red color provokes a split-second of panic in me, when I think the intent is merely to caution the user that the brackets are not right. It doesn't help that a bracket mismatch may span many lines, painting a large screen area in a "four alarm fire"color.

Maybe a darker shade of red (for a light window background) with white text?

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I agree, the bracket mismatch indication never got further from a "prototype" - thanks for reminding!

Done - the default color is a bit darker red, and it's customizable.