This scanning message appears in a textbox where there are 2 opening braces [ that occur before any closing brace that would match the first opening brace.
For example:
[[1d] [1Dddd]
If you do not see the offending brace, it may be because you are using a special font (such as holidays boxes) where the braces characters are replaced by another character.
Topic 174495, last updated on 12-Mar-2019