We found the cause for this error!  We are working on an application to create shares on the isilon cluster and ran into some issues with the creation of the local path.  The application was creating the share but not the local path.  (The same thing happens with MS Server Manager when trying to create a share and giving an invalid path).  We had 4 or 5 of these shares in place that had no valid local path.  After these shares were deleted the webUI was able to diplay the File System Explorer page again.
Hello,  We have developed a problem with the web UI on one of our Isilon 7.0.1.5 clusters.  When clicking on the File System Explorer link we get an error: [IMAGE] Saving the html we see this info (removed the html tags):   File "/usr/local/share/webware/WebKit/Application.py", line 650, in runTransaction     self.runTransactionViaServlet(servlet, trans)   File "/usr/local/share/webware/WebKit/Application.py", line 738, in runTransactionViaServlet     servlet.runTransaction(trans)   File "/usr/local/share/webware/WebKit/Servlet.py", line 59, in runTransaction     trans.awake()   File "/usr/local/share/webware/WebKit/Transaction.py", line 137, in awake     self._servlet.awake(self)   File "webui/Filesystem.py", line 849, in awake     self.sharepaths = [s.path for s in smb.shareEnum(False)]   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/__init__.py", line 690, in shareEnum   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/__init__.py", line 1213, in share_enum   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/__init__.py", line 1124, in share_get_info   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/__init__.py", line 895, in shareBinarySdToAclList   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/sd.py", line 191, in sdBinarySdToList   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/sd.py", line 226, in _sdBinarySdUnpackAcl   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/sd.py", line 435, in _sdAclBinaryToList   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/sd.py", line 536, in _sdAceBinaryToDict   File "/usr/local/lib/python2.6/site-packages/isi/config/smb/sd.py", line 700, in _sdAceFlagBinaryToString TypeError: Unknown Ace Flags Time: Thu May 30 15:34:16 2013 File: webui/Filesystem.py CWD:  /usr/local/www/webkit Path: /usr/local/www/webkit,/usr/local/share/webware,/usr/local/lib/python2.6,/usr/local/lib/python2.6/plat-freebsd7,/usr/local/lib/python2.6/lib-tk,/usr/local/lib/python2.6/lib-old,/usr/local/lib/python2.6/lib-dynload,/usr/local/lib/python2.6/site-packages,/usr/local/www/webkit  Environment: HOME:      / OLDPWD:      / PATH:      /sbin:/bin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin PWD:      /usr/local/www/webkit RC_PID:      1385  Will mention our second 7.0.1.5 cluster does not experience this problem.  Any ideas?  This is affecting our ability accessing the cluster filesystem with our application remotely.
File System Explorer page in Web UI generates a 500 - Web Application Error 
when clicked