I am experiencing some errors with the Marketing Cloud particularly with Contact Builder and the display of population, attribute groups, and channel order as well as the journey builder when setting up a new entry event (in that case I cannot continue and set filters due to a never ending pre loader).
An error message appearing:
An error occurred during loading this procedure
It is asking to try again later or contact global support if the error endures.
Since there is no further error message, I cannot be more precise than this. However this error occurred twice the last couple days.