Over the weekend PA Monitor 4.2.1.44 started sending frequent alerts for multiple servers. Eventually, the alert messages were garbled (example: サテライト[King Internet]からは1d 19h 2m聞いていない。 12 Aug 2013 08:54:43)
Looking at the PA Monitor windows client, column headings and button text is garbled text also.
Re-starts and reboot did not help.