Lingotek TMS plugin for Studio 2022: Login doesn't work

Just recently, my Lingotek plugin for Studio 2022, which had been working perfectly, has started not logging me in properly. 


I click Sign In and get this screen as usual:




After I enter my login details, I get the following screen within the small pop-up, but the Lingotek Plugin in Studio isn't actually logged in, and none of the functionality will work:

I can log out and in again within the pop-up, but this does not do anything. I have tried opening and closing Studio, uninstalling and reinstalling the plugin, and still the same.

Any ideas? Thanks :)

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