Serious Error in Cloud Flow Designer
Mike Arthur • 20 June 2017
What to do if you get "We're Sorry but a serious error occurred. Please don't close the cloud flow designer window. Contact Salesforce Customer support as soon as possible." when trying to save a Flow.
If you see this error when trying to save a Flow, there doesn't appear to be any further information available. But there is!
Click 'OK' and, in Windows, press ctrl-shift-M, or Mac command-shift-m. You will then see diagnostic information. Click each box until you see something useful.
In my case, the Flow had been deployed from another org but the field level security on one of the referenced fields did not allow access.
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