@Zeroeth I've got a small update on the RDP printing issue. They've figured out what is causing the problem. They've changed the status to "in progress". Not sure when the fix will be made or what version it will be implemented in. They downgraded the priority to "minor" but since this affects everyone's ability to print I would hope it makes it into 1.5.1.
BTW, here is the JIRA issue: https://issues.apache.org/jira/browse/GUACAMOLE-1755