We are currently investigating this issue together with the KNIME team.
Something similar was reported in the forum already: [forum entry]
Before re-installing KNIME completely, @gab1one mentioned something about a command line switch for KNIME (maybe -clean ) that could solve these issues.
Regarding the version downgrade, I’m quite surprised myself and didn’t know this could happen. Maybe there was an issue with KNIME’s extension build pipeline at that time?
Best regards
Arne