Can you paste the VisualForce for the account view page and one that’s working (like the opportunity) one? Can you also include screenshots of the button/actions/links page for the account and opportunity object?
You are back in business. It was the strangest thing, we had to re-create the page assignment and it worked. We deleted the old page assignment so you wouldn’t get confused.
Yea, it took 3 of us trying everything under the sun to get it fixed. Sorry it took so long! Now you can focus on doing all the great work you do for your clients and the community 🙂