I actually think this may not be referring to standard academic probation (for bad grades)... It's asking if you were found responsible for a disciplinary violation ... related to academic misconduct. I think they're asking if you were ever placed on probation for something like plagiarism, especially since there's a later reference to resolutions and fines.
If I were you, I'd contact the school and ask for clarification, because if they are asking about plagiarism, you don't need to unnecessarily draw extra attention to a semester of bad grades. If it turns out that they'd like an explanation anyway, I agree with sing something's advice. Just be honest, and trust that they'll understand that you've grown since then.