"Warning: Problem downloading default material"

[Sebastian_Galo]

Since one of the bigger updates this autumn I continuously get these prompts when opening various designs. I think it's a custom material which lost it's link or something. All my favorites are lost as well. I have no problem just starting from the beginning as long as I get rid of the messages. I do have one custom material I would be pleased if it could be saved which are applied at a lot of parts, but it's not the end of the world if not possible.

I've tried new installations and the messages appear at three different computers.

What can I do? 

"Warning There was a problem downloading your default material. Fusion 360 has reverted to using the default material Steel-Satin."

"Warning Your default material is being downloaded. After the download is complete, it will be applied to your model automatically."

[Sebastian_Galo · Accepted solution]

Problem solved by removing an add-in called Shaper Utilities. It was outdated and probably caused some kind of material/shape conflict since it's an SVG shape exporter. I didn't get my favorite materials back but Fusion doesn't give me warning-prompts anymore so problem is gone. My original custom materials do still work though, no links broken even if I thought so.