some strange issue

Updated to joomla 3.2 on 2 similar sites, both upgraded from 1.9 to 1.9.1

One site works perfect
Other site if I am not logged in and click on profile in userlist i get the profile, however as soon as I log in i get 500 error

So here is what I found so far
When logged in, one site links the list to:
/index.php/page-view/userprofile/name (working)
the other
/index.php/page-view/userprofile/name (not working, though same link works when not logged in)

When however I log out of working site it links the list to

/index.php/search-the-data-base/userprofile/

where as the non working site then displays the same link as when logged in and displays profile

Today I was fighting a 500 error to. Maybe this will help in your case too:
I had the error when I clicked a user in the backend user list. Then it has thrown me a 500 error.
To nail it down I unpblished all tabs. Then it worked. Then published tabs one by one until I knew which tab caused the issue.
Then I unpublished all fields from the tab and published them one by one. Magically the 500 error was gone and I had all fields published again.
I have no idea what has caused this error or what fixed it finally.

Ensure you've a public and published Joomla menu link to CBs profile page. This is mandatory. If a user trys to access a profile with a menu link they can't access then Joomla will act as if the location does not exist. If issue persists then enable debug mode and maximum error reporting in Joomla global configuration and retry to expose any errors.