I have installed Joomla with no cofiguration changes, straight out of the box, with no problems at all
I have spent some time trying to break it to give me a 403 error but up to now have not succeded. Every other error but not that.
So either your installation, database or server is corrupt.
If you want me to look into Joomla for you then create a user/pass with admin permissions and send that to me in a PM. I promise I will only check out your configuration, make no changes and then inform you via PM what I find, if anything. We/you can then post the fix, if we find one, back to the forum so others that follow may read the result.
If not then there is not much else I can suggest except perhaps to look in the apache/loghs/error.log
for a clue immediately after you receive the 403 error. The 403 error is fairly general and does not give too many clues as to its origin other than you don't have permission etc. Can be hard to find if you have tried the obvious.
expatCM wrote:...Is there another CMS you feel is particularly good?
Take a look at Xaraya
I have not tried it out but it looks neat and interesting and might be worth a try if you feel Joomla (always being hacked) is not your cup of tea.