I recently installed:
'Release 5.0.8_GA_2462.RHEL5_20080709170039 RHEL5 FOSS edition'
I noticed that when I right-click on the folders bar on the left tree and select Advanced Search I get a error on either IE7 or Firefox. The error occurs if I have script debugger enabled otherwise simply nothing happens.
Now, if I go to the top bar and select Advanced Search, that works fine and then if I go back to the Advanced Search on the folders bar; it will then work.