used gold bars to continue level and screen went blank

hckv

used gold bars to continue level 1770 as I only needed 300 points to pass the level.  king.com background still appeared but game went blank so I couldn't continue the level. 

KingsPinn

This has happened to us all. Unfortunately it's a case of chalk it up and play the level again. 

Maybe follow these step here, less chance of it happening again then: 

https://care.king.com/en/candy-crush-saga/cant-get-your-games-to-load-on-facebook-check-this-out