Intellij 10.5 with clover 3.1 is throwing: "Error: CloverException: unexpected token" for enums

Classes containing enums are failing to compile, and display the error "Error: CloverException: unexpected token: <<enum name>>" or "Error: CloverException: unexpected token enum".
Have attached example failing code with company name and details stripped out.
I've marked this as a blocker as I can't get the plugin to work at all. I thought it may have been clashing with the scala plugin but I have disabled that and there are still problems.