Blacked out map in MapViewer

Question

Howdy folks,

I'm running into an issue that I've never seen before. I shared two feature classes to a group layer from Pro to AGOL with no issues. When I try to view the group feature layer in MapViewer, I get this black void in the map frame (see screenshot).

What's going on here?

TIA!

matt_g_g · Answer

Did anyone ever find a resolution/cause for this? I get this intermittently from Firefox. It was originally with Enterprise 10.8.1 but has recurred with Enterprise 11.3.

Ade_Bruijn · Answer

Update: Rebooting the PC solved the problem

Ade_Bruijn · Answer

Unfortunately, I'm suddenly getting a black map in FireFox, Chrome is fine, but Edge is also having problems. EB works fine, but loading the webmap results in a blank screen. Clearing the cache and restarting FF didn't solve the problem. Hopefully rebooting the PC will fix it, all the maps I try stay black. Also tried maps from various organisations

Boomspiegels (arcgis.com)

https://www.arcgis.com/apps/mapviewer/index.html?webmap=873e7ca1457a4724b162c42bbf0ff97c