Product and version:
FileMaker 17 WebDirect
OS and version:
macOS High Sierra 10.13.6 (17G65)
Browser and version:
Google Chrome Version 67.0.3396.99 (Official Build) (64-bit)
Apple Safari Version 11.1.2 (13605.3.8)
2015 MacBook Pro 15 inch
Web viewers, when viewing any site in WebDirect, randomly go blank. The user can be doing nothing and the web viewer will suddenly just go white.
How to replicate:
Create a layout with a large web viewer on it. Point it to some web site (I used app.dayback.com or https://pitchfork.com). After some period of time, sometimes instantly, the web viewer blanks out. Sometimes I can make this happen by switching desktops in macOS. Sometimes it happens when I'm working in the web viewer. Sometimes it happens for no reason at all.