What OS are you running?
AFAIK this is only really a problem in Windows XP, and I'm afraid that XP support has been officially dropped with Opera 37 anyway, making it even less likely that the problem will ever be addressed.

Incorrect, this problem affects all windows versions. I'm on W7 and W10 currently - same story.
Time to check Vivaldi again - they released 1.0 lately 🙂