When setting up/modifying a search rule, after clicking Continue MSE complains about "Rule isn't valid: Your rule contains keywords with special characters only. Please remove those keywords and save your rule again". It won't let you continue.
Only it doesn't include any keywords. In the above example, I took an existing rule that had been working fine for the last 2 weeks, and just removed a portion of the last keyword.
Is this an "unhelpful error" that really means "we're having problems, ask again later" or "your quote is full" (which it isn't)?
Or is there actually some sort of hidden special char?