This happens to my team a lot: Maddening Visits Web Page Trigger Bug (which really isn't a bug - just an inconsistent way Marketo tracks/captures specific click activity). In fact, just when we think we have the rule down pat - e.g., always keep the "http://" in the Link Name URL value whenever use an 'IS' evaluator for the value of a web page - Marketo will introduce the red squiggly and refuse to activate the smart campaign.
The rules are inconsistent, depending on the type of trigger, filter, constraint, etc. It would be so helpful if Marketo would tell us what those warnings are when presented with the following:
Here is the proper construct of the URL for these types of triggers/filters when using the "IS" evaluator - I'd like to see these added to the warning message when each scenario presents itself):
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