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Since Saturday, July 11th's scheduled maintenance window (originally expected to last "several hours"), I'm still unable to open any Process Model in my Community Edition environment — clicking a process model shows a continuous "Loading..." tab followed by a 504 Gateway Time-out error (URL pattern: /suite/process/startdesigner.none?idToOpen=...).
I tried creating a brand-new Process Model, and even that fails the same way, and I also created an entirely new application from scratch and tried opening a fresh process model in it, which also hangs and 504s — so this doesn't appear to be specific to my app or objects.
The environment is on Appian Version 26.6, Appian Cloud hosting, and the maintenance banner is still showing as of today (July 13th, several days past the original "several hours" estimate). Is this a known ongoing side-effect of the maintenance/upgrade, and is there an ETA for resolution? Happy to share screenshots if useful.
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