In the latest version of Chrome, there is a new feature for saving system resources. In some cases, it causes white screen instead showing a webpage (WSOD).
Before getting mad, try to switch off the hardware acceleration in your browser and close all the open instances once before you try it again.
Of course, CPU usage will be higher a bit, but it will not cause problem in an average PC even if you handle subbed accs in other tabs. If you have enough memory in the machine, you'll have no problem since the tabs not in focus will not use so much CPU.
Also reset zoom to 100% and any of resized components to have the page objects appeared normally.
