We too are not seeing any messages displayed on the RioLog when connected wirelessly. * [Note, our laptop is running Windows.]* I have not had time to investigate much yet and plan to try it on a system that was able to successfully view messages on the RioLog last year. We do see the messages printed (with both printf and cout) on the DriverStation log when you select “+ Printing” display option.
We had the same problem, no riolog output. We’ve taken to ssh-ing to the robot and cat-ing or tail-ing the log file. You can also scp the log file (the name escapes me but you can see the name when eclipse is running the deploy scripts) and save the output.