Blank Manager with undefined message and unfunctional navigation

[bruno17]

not sure, if this is related

Blank manager with undefined message

Several of my customers keep complaining they get random blank managers and the ‘undefined’ message. We cannot work out why this happens. A call from my customers ends up in endless testing of browsers, caches, other PC’s/laptops, other logins, etc. It’s becoming quite annoying since this has been there for years now. It’s affecting the service level and relationship to my customers. Does anyone have a clue or solution?

he was also talking about an ‘undefined’ message