There may be some helpful ideas or processes within the topic to help resolve this issue, as presented here:
•Troubleshooting permissions issues in Mac OS X:
http://support.apple.com/kb/HT2963
Warning:
"This document describes how you may modify permission settings by entering
commands in the Terminal application. Users unfamiliar with Terminal and UNIX-style
environments should proceed with caution. The entry of incorrect commands may result
in data loss and/or unusable system software. Improper alteration of permissions can
result in reduced system security and/or exposure of private data..."
Also, user accounts, files and ownership issues arise in OS X and some are tedious.
Some items that go by the name ACLs can be part of the picture.
•Perplexed by Permissions - macworld:
http://www.macworld.com/article/1146211/perplexed_permissions.html
{And for those outside the experience of 'First Class'...}
'First Class' brand software:
http://www.firstclass.com/Resources/ClientDownloads
About 'First Class'
http://en.wikipedia.org/wiki/FirstClass
{The software 'First Class' has several versions, some work w/ older PPC Mac G5 (G4?) & run within versions of OS X; there are older versions for consideration in their web site. Be sure the one you get is supported by both the hardware/software configuration of your computer. If there is a minimal RAM requirement, or other details to consider, be sure to meet them. However troubleshooting privileges/permissions is another topic.}
Hopefully the information on privileges and permissions helps somewhat.
Good luck & happy computing! 🙂