The above was right as most suggested it there, just uninstall and reinstall back, because there's no rollback on the update it will possible for you to back the previous version. I stopped using this coin tracker app earlier because even the token is delisted on exchange but still I can see on the app, instead, you can use Coinmarketcap or other coin trackers that fully functional to this.
Here's the Reddit thread similar to your issue.
Even though Coinmarketcap and other trackers do exist but still not really that as convenient or good in UI compared to Blockfolio.I had been using this tracker for years
and i do agree on what you had point out about those delisted tokens which they might able to improve it out later on.
When it comes to functionality then Blockfolio is much better but well this is only self preference. For op, those recommendations had already solved out the problem?