1) I've set up a workflow that alerts contacts in a field when a checkbox is checked ("when a row is changed"). However, if I want to re-trigger the workflow because changes have been made to the sheet, simply un-checking the box, saving the sheet, and re-checking the box doesn't seem to trigger the alert. I've even tried un-checking the box, changing other fields in the row, saving, then re-checking the box, but nothing seems to work.
2) A different alert workflow was working great, now it's not sending alerts at all when the trigger criteria is met.