Lightroom 5 will not let me sign in to my Adobe account
I have Lightroom 5.7.1 on my Windows 10 64bit desktop. I've been trying to sign into it via the "Get started with Lightroom mobile" drop down without any luck. After I enter my password, the popup screen just kinda grey's out. It does the same thing when I try to used my Google account.
Here's a screenshot:

Since I'm able to post this using the same account as I'm trying to sign in with in LR, it's obviously not something to do with me messing up my password. I copy and paste from my password manager.
I have tried shutting down LR completely and trying again.
So, any suggestions?
Thanks!
