I also have the same problem. When the white screen gets larger and larger, I go to WINDOW and CLOSE ALL. This is a temp fix but it's better than nothing. I noticed this happening when I switch screens from one template to another. For example, if the invoice I'm working on is using template "ABC" and I arrow left to the previous invoice and that invoice is using template "123", that's where I see the white screen starts to show up.  It's so annoying!!