Normally the application developer developes any application that is compatible with an OS. The OS is not built taking into an application into account. So..its an issue that requires to be addressed by Opera.
Have you tried updating to the latest version of Opera Mini. The one provided on http://m.opera.com is only 7.0.31380, while the one in Nokia Store is 7.0.31385. I am using Belle Refresh too on my N8 and am having no problems.
Let us know how you get on.