Lenny,
No, that file is for both Joomla 1.6 and 1.7.
Can you try the following:
* Disable the CB Profile plugin
* Enter the Configuration area of JFBConnect
* Simply hit "Apply" - You don't need to change any settings, though you're free too if you want
* Re-enable the CB Profile plugin and see if it works
The above is a workaround for a known bug that can happen when no settings have been applied and a profile plugin is enabled. If that doesn't solve it, please let us know your CB and Joomla version (1.7.x) and we'll go from there.
Let us know how that goes!
Thanks,
Alex