SharePoint Designer unable to open SP2013 Workflows

[Brent Ellis]

I am currently unable to open any SharePoint 2013 workflow from SharePoint designer (for SPO).  Is anyone else able to confirm the same?

• tried on multiple computers, multiple OS
• cleared all cached SPD files
• tried multiple sites
• SPD2010 workflows open fine

Just a blank screen that looks like this:

[#2]

Ey Brent,
I have just opened a site with some "old workflows" and everything seems to be right

[#3]

It's been a couple years since I've seen a similar issue (I could open workflows but they'd just be blank), but this update seemed to do the trick for me when it did happen.