Problem solutions I figured out recently that might help someone:

-If you’re getting that desktop tumblr problem like me where posts often won’t load and you use Windows 10, there is a GREAT third party tumblr app called Ouga. It even lets you stay logged into accounts under different emails and switch between them in 2 clicks.

-Windows Network access problems on LAN. If your network is asking for credentials and you don’t know what the username and password are, use the name of the computer that is trying to gain access and the name you use to log into your profile in this format: “computername/loginname”. And put that in the username field. The password will be whatever one you use to log into the computer you’re trying to access. If this doesn’t work, you can bypass this by logging into your microsoft account on both computers.