When trying to open transition view from Page Titles Report, it cannot be opened because the default action_title_category_delimiter (/) is used in the call even if it’s overnwritten in config (in our case with :: )
URL as generated by Piwik 3.02
https://piwik.mydomain.com/index.php?date=2017-05-23&actionType=title&actionName=Shop%2FCheckout&expanded=1&format=JSON&module=API&method=Transitions.getTransitionsForAction&filter_limit=-1&idSite=22&period=day
Working URL (constructed manually)
https://piwik.mydomain.com/index.php?date=2017-05-23&actionType=title&actionName=Shop::Checkout&expanded=1&format=JSON&module=API&method=Transitions.getTransitionsForAction&filter_limit=-1&idSite=22&period=day