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Alt+F10 does help, but even with that workaround the right click stops working after a while. Seriously, there have been several updates to Opera but the issue is still not fixed! Like come on, don't make me switch to Chrome, I've been so used to Opera (for everything other then streaming, another issue that's not fixed)!
I have the exact same problem, I use the latest stable version of Opera on Ubuntu. It started happening a few days ago and it's extremely annoying. If it's not fixed soom, I may have to resort to using another browser as well. Googling it I see it's not the first time this happened either, but I couldn't find any solution other than waiting for a future update that may fix it.