weird experience w TD screen

this has happened twice in the last few hours, 1st time it happened, I thought it was a deleted thread

I walk away from my screen with a thread open & come back to computer & the screen is white

I can see the top of the site, but everything below the TD logo is blank

I tried to refresh my browser (chrome), but the screen stayed blank

open a new tan & presto, back to TD

this last time, I even tried using the back button, but still got blank screens for prior TD boards and threads

new tab, and here we are

no screenshots