We're having the same issue as described in this post.
http://www.postgresql.org/message-id/CA+OCxoxoCGc7d7tRdyC5-32dDMtXyT1m59s_Lk
3moHTXxfMvmw(at)mail(dot)gmail(dot)com
It sounds from the post that this issue was fixed. Was this change ever
pushed to stack builder?
I was thinking maybe it wasn't since the latest source release of pgAdmin
http://www.postgresql.org/ftp/pgadmin3/release/pgagent/
Is before this change was put into place and the pgAgent.exe packaged with
stackbuilder reads File version 3.3.0.0, Product Version 3.3.0
Thanks,
Regina and Leo