Does the issue happens even with sync disabled?
No! Only with enabled sync)
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Hi! I have the same problem on different computers!!! I tried to instal opera beta\stable\developer but it's not help me.
I found out that it happens when opera tries to synchonize my opera account. I clear this folder c:\Users\username\AppData\Roaming\Opera Software\Opera Stable\Sync Data\ and deactivate synchronization and now opera work good. But synch. is realy useful thing...