It’s recommended to search the forum (and consult the Guides) before starting a new thread. There are > 50 results when searching for blank page and this 1 is 1 of them.
If you read some of the threads with problems, you could read that the info you should give is OS, Manager’s edition (Desktop, Server or Cloud) and Manager’s version. When updating Manager you should indicate from which to which version. Supplying screenshots of the problem will increase the chance of getting help.