Gutenberg posts not saving

I’m not sure if this is the right place, but I have been all over the internet to find a resolution to this issue.

I installed the latest WordPress update and started working with the Gutenberg editor. Posts would not save, and neither would updates.

One site recommended updating PHP to version 7+, which I did, but that didn’t work.

Another site recommended re-saving the permalinks settings – nada.

Another recommended whitelisting my IP address, which had already been done in WHM.

I figured it might be an IP issue because I discovered Gutenberg posts work from my office computer (Mac Mini) but not my home computer (MacBook Pro), using Safari on both.

Since my home IP address is whitelisted, I’m stymied, assuming the problem is somehow localized rather than in WP setup.

Thanks for any help or suggestions.