If the value is already 'true' and they choose 'true' in a form fillout, that is not seen as a 'change', so there is no Change Data Value activity created which could trigger the campaign. To work around this, I've seen other customers use the trigger Fills Out Form in conjunction with a filter (FieldName is 'true').
I hope that helps,
Thanks for the fast response!
Would there be any issue with setting a time constraint for [field value set to true] [within the last 1 hour] (that is what I am doing now)? We currently have a different smart campaign that automatically removes the true value after 1 day.
My concern is that the trigger happens instantly and I am worried that it is not waiting long enough for the value to change in the system for the filter to kick in.