The web administration interface has a module called "VSM". If you are new to ThinLinc, you might not know what VSM means. Perhaps it would be better to spell out "Session Manager" or something similar.
We should also consider if we really should group the master and agent together. Perhaps it is clearer if they are both on the top level.
Perhaps the Subclusters page can be under Master, and both Master and Agent should be at top level.