When importing puppet classes, if there is a parse error the UI will basically show no changes, rather than reporting that there was an error. The error is logged in the proxy's log, but it would be very helpful (at least to me) for that error to be pushed back up to the UI. We catch most errors at commit-time via syntax checking hooks, but every once in a while something slips through and inevitably results in someone spending a bunch of time troubleshooting that probably could have been saved if the error had been presented directly to the user.