First page of PDF not visible in Skim when using "Two pages" PDF Display in OS X Sierra

I'm having an issue with Skim since upgrading to OS X Sierra, the first page of a PDF is not visible in "two pages" PDF display mode (the left-hand side should be the first page, but is instead grey): I can make the first page visible if I switch to another display mode and then back to two pages, but as soon as I flip the page, the first page becomes invisible again! This has only been an issue in Sierra, Skim was working fine in 10.11. Does anyone know of a fix?