There were a lot of fixes for graphing and the logger process in general put into the 4.5.0 beta and rc1 releases. If you are running 4.0.x Network on a Mac most of the fixes are detailed in this post
http://www.zimbra.com/forums/installation/4579-logger-service-issues-post32474.html
We will also be updating the openSUSE builds to support 10.1/10.2 in an upcoming release.