Looks like quite a few people are dealing with the same issue, so it probably isn't just an account-specific problem. If the Redeem button has disappeared for weeks, it's likely something Opera needs to fix on their end. Hopefully they'll post an update soon because watching your points pile up without a way to use them is like collecting arcade tickets when the prize counter is closed. In the meantime, I'd avoid clearing your app data and keep an eye on the official announcements for any updates.