Permission issue opening the web client?

coreypower

Hi all,
For a customer we have noticed that some users are not able to open the web client without having super (or similar) permission. The user can open the rtc with their permission sets (including BASIC) and operate fine but as soon as they try to open the web client, they get the error stating "A server error has occurred, and the content cannot be displayed.." If I then add the Super permission, the web client fires right up with no issues. It appears to be something related to a missing permission but I cannot for the life of me determine which one. Anyone have any ideas? Any help much appreciated.