Somehow my tablet's speed dial had gotten duplicated after the last time I reset my sync data. I deleted one of the copies only to find out that Opera Android would crash as soon as I opened it making it completely unusable! The only thing I could do to fix this annoyance was to quick copy what I could of my Android Speed Dial to the PC Speed Dial then wipe Opera Android's data and reset my sync data (for the umpteenth time this year ) forcing me to start from scratch thus, losing all my offline pages and Android history. In fact, my Android history has NEVER synced since Opera 40 something (can't remember exactly when) and sync.opera.com shows only random items some going as far back as an year ago and only a handful of actual recent history links. This is WORSE than Firefox's sync. At least with FF, everything got synced even if it did have the same bug as Opera sync with duplicating bookmarks. Sync was the ONLY reason why I started using Opera in the first place since Firefox changed their sync system making it incompatible with the version of FF I had been refusing to upgrade to due to their hideous Australlis UI and Dolphin Browser had stopped supporting their FF sync extension which no longer works. Because Opera has been having sooooo many problems with sync that the devs obviously refuse to fix I have been FORCED to upgrade FF inspite of my dislike of the UI and removal of most extensions. For the devs to ignore our complaints and not fix sync is totally unacceptable.

Had to reset my sync data yet again because the duplicated bookmarks folder issue happened again. I'm not sure if that was before the fix or not since I didn't notice the double folders until yesterday. So far there's no double folders, but with sync's track record, I don't really trust the duplication bug not to come back.

@haxanus Windows 10 build 1803 (aka spring Creators Update) doesn't exactly play well with Opera in general. With me, sync had messed with flash after the repair shop installed 1803 onto my laptop so now I have to use an addon inorder to get flash to work. Also it causes Opera to load pages slower than any other browser to the point that I would get page could not be loaded error pages more often than I ever did before being slapped with 1803.

I had that problem too when I refreshed the sync page, but what I did was reset my sync data, logout and back in on both PC and Android versions that I had, then shut down both PC & Android browsers (not the computer or tablet). When I reopened both browsers, everything was working fine and the duplicate bookmarks did not come back. I would only do this if you have a bookmarks backup or already have bookmarks on either of your browsers otherwise you'll wind up with no bookmarks whatsoever.

@lopalop2 Have you tried going here: sync.opera.com to see if anything got synced? You can also try logging out and back in on either device, sometimes that makes things show up.

It's not gone. You just have to go to the bookmarks tab and right click on Bookmarks Bar from there.

@concretable I don't let Opera auto-update and I still get the unwanted bookmarks. They may skip an update or two, but they did show up the update before last with me.

@concretable That is so, however, after you update Opera again, they'll sneak them right back making emptying the trash a temp workaround. Hopefully the opt-out setting in Opera 56 will truly fix this reprehensible issue. Opera needs to clearly state upfront that they will be adding 'default' bookmarks with each update so there will be no surprises. Hey Opera, News Flash -- NOT EVERYONE likes surprises!

@deestonic I quite agree. Opera has gone down the sewer drain with all the problems I've been having with it 1)Sync working only when it feels like, 2) Connecting pages slowly or not at all due to Windows 10 Creators Update and now 3) Sync screwing flash up to a point where I need an addon to have flash working even though it is installed and should work.

@wlisik Have you tried importing them from a desktop/laptop version of FF then using Opera's sync function to sync them to mobile? What mobile OS are you using Android or IOS? What version of Opera is it?

Sync is working for me although it generally syncs what it wants when it wants.

Can you check here sync.opera.com and see if anything has been synced there? You can access your bookmarks and history there. Passwords will be encrypted so you can't look at them, but they should be there as well along with any devices. If there is, then you can manually add your bookmarks to your devices.

Offline pages will not be lost if sync is reset. They are stored on your device wherever Opera is stored and should remain there as long as you don't uninstall Opera. That is the one thing that Opera doesn't sync I think.

As for Speed dials not syncing, you have to manually import them they will not appear by themselves. If I remember correctly, Bookmarks and History are the only things that show up instantly across devices. Tabs and speed dials can be accessed on Android through the tabs menu (Numbered square on top right). On desktop/laptops synced speed dials from other devices are listed under bookmarks --> other speed dials and can be added to your desktop/laptop by copying and pasting them to that device's speed dial.