This scanning message appears if Q++ encounters a textbox where all the opening and closing braces  are matched except for a lone closing brace ] that occurs after the last matching pair of braces. For example :
[1d] [1Dddd] 1w]
If you do not see the offending brace, it may be because you are using a special font (such as holidays boxes or Hindi or Arabic) where the braces characters are replaced by another character. If this is the case you will need to correct that font to make sure that characters that are reserved for Q++'s internal use are not used by accident.