I can not install the redmine traceability module on the redmine turnkey application. I tried with version 11 and 11.2 and both gave the error "Stack level too deep" completely blocking the application. Somebody else already mentioned this on stackoverflow with the same problem. This module is very nice as it could relate test cases with bugs, which would greatly improve the usefulness of Redmine. It would be a pity that the Turnkey appliance would not support this.