October 6th 2011 - Version 9.1.2.1687/1688
If you update from V8:
PRTG's web server now has a protection mode which can cause a slow Enterprise Console. See knowledge base
Note for users upgrading from V8: SNMP sensors now use the "Outgoing IP" setting. See knowledge base
On Windows 2003 at least SP1 is now required for core and probe
New: [Sensors] New sensor type “Windows Scheduled Task”
Improved: [Sensors] When creating new Windows MSMQ Queue Length Sensor and Windows Print Queue Sensor you can now select queue from a list of available queues
Improved: [Sensors] QoS (Quality of Service) Round Trip Sensor now displays RTT (Round Trip Time)
New: [Maps] New map object resizable colored icon, see knowledge base
Bugfix: [Core] Fixed a bug where users were getting gray (unknown) sensors when they folded up/down a group at an unfortunate moment
Bugfix: [Core] Fixed a bug where an autodiscovery scan could bring down all SNMP sensors
Bugfix: [Reporting] Reports PDFs in landscape orientation did not always work properly
Bugfix: [Enterprise Console] Drag&Drop of devices did not work reliably
Bugfix: [WebGUI] Fixed various encoding issues for multi-byte languages
Changed: [Enterprise Console] Various improvements based on user feedback
Changed: [WebGUI] Tightened security (e.g. non-admin users can not view data on the Status page any more)
Various smaller changes, fixes and an updated manualBugfix: Fixed a validation error for active directory settings without domain
http://www.paessler.com/prtg/download