Just tried to run the upgrade on my existing (a little outdated) blockchain. After running credits-qt or creditsd with '-reindex -checklevel=2' both applications crash:
terminate called after throwing an instance of 'std::length_error'
what(): basic_string::replace
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
do I need to wipe my old blockchain? I thought it can be upgraded with the mentioned parameters?
If you where running a version that is never than .60 it should be no problem. But don't start with -reindex. That will cause problems if your blockchain is trimmed.