Random full screen errors

I’m experiencing an error when saving and opening files.
Intermittently, pinegrow will show this error on a full screen, then the html page itself will be shown full screen (taking up all of the pinegrow window) for about 3 seconds, then it goes back to the normal pinegrow UI.

Error details:

invalid is blocked
requests to the server have been blocked by an extension
Try disabling your extensions.

This happens even with the stock pinegrow starter files.
Javascript is disabled.
Linux x64
pinegrow 4.8
linux mint/ubuntu 16.04

What can I do to fix this?

Hello Rob,

Just a head’s up, this is a user forum, and while it’s monitored by the Devs, you should probably make sure to email them directly on this as well.