Hello guys. I had the same problem, all my piboards were gone and I couldn't find a way to recover them. I didn't have sync turned on but after trying out few things I was still able to recover my pinboards. Here's how to do it:

1. Log into your Opera account. Once you're in, click the person icon at the top right corner of the browser. There you have to click on your icon to open your Opera profile dashboard.
2. Click on "View your synchronised data" panel to open sync content section. There you will have your bookmarks, tabs, pinboards, etc. Click on the pinboards section. It will open the list of your pinboards. The problem is, when you click a pinboard to open and then you come back to main pinboard, it still shows no pinboards, which means that you'd have to do it every time to open the pinboard that you want. To fix it:
3. go to Settings->Synchronisation and turn on the sync options. You might need to log off and back on again to make it fully work.

Like I said, I didn't have the sync on and I was still able to recover my pinboards so obviously they were not completely gone, they just went invisible for some reason. It might fix the problem for you so try this method and see if this works for you.

Hello guys. I had the same problem, all my piboards were gone and I couldn't find a way to recover them. I didn't have sync turned on but after trying out few things I was still able to recover my pinboards. Here's how to do it:

1. Log into your Opera account. Once you're in, click the person icon at the top right corner of the browser. There you have to click on your icon to open your Opera profile dashboard.
2. Click on "View your synchronised data" panel to open sync content section. There you will have your bookmarks, tabs, pinboards, etc. Click on the pinboards section. It will open the list of your pinboards. The problem is, when you click a pinboard to open and then you come back to main pinboard, it still shows no pinboards, which means that you'd have to do it every time to open the pinboard that you want. To fix it:
3. go to Settings->Synchronisation and turn on the sync options. You might need to log off and back on again to make it fully work.

Like I said, I didn't have the sync on and I was still able to recover my pinboards so obviously they were not completely gone, they just went invisible for some reason. It might fix the problem for you so try this method and see if this works for you.