Cumulative path 3 of Veeam Service Provider Console (VSPC) V5 was released last week.
Anton says in his weekly digest:
“It] addresses a critical issue which may cause a backup encryption password to be reset. If you're managing Veeam Agent for Microsoft Windows with VSPC and have backup encryption enabled, then you need to install this patch and re-enter the password. This is required because the original encryption password can be reset by the automatic policy resync task which is started after you upgrade to version 5.
To help you with locating agent jobs that need to have their encryption password set again, with the patch installed we show a failed job session for all affected backup agents, so don't be surprised when you see those. After applying a new password, you will need to rerun all affected backup jobs.”
You can download the patch here:
https://www.veeam.com/kb4163