event id 4098 when applying printers via user group policy

After a reboot of my domain controller, I got a lot of event ID 4098 warnings in my appliucation event log as seen below.  I was getting several dozen errors per day - one for each printer.  My user GPO had been assigning printers for months with no problems, but after a reboot, this started coming up:

I fixed this by editing the group policy.  Go into the group policy for each printer and go to the common tab.and check the option for "run in logged in user's security context" as show below:

pdf995 requires Program Compatibility Assistant on Windows 7

I had a Windows 7 computer where I had installed PDF995, but found that it didn't show up in the list of printers. Then I found this - which said that you need to make sure the Program Compatibility Assistant service is started. In this case, the PCA was set to manual - but it was not started. I started it - uninstalled PDF995 and reinstalled it and voila - it worked. Weird.