After some time having different extension suppliers using different jquery versions and running into conflicts, I solved it the following way:
(Magento CE 18.104.22.168).
The no conflict solution is needed anyway to avoid conflicts between jquery and prototype.
CSS Settings: Merge CSS Files = No.
Clear the script caches and compile system.
This solved it ... everything is running now, as the specific areas using their own script files having different jquery versions. This setting may have performance issues ... but our system is running fast enough.
If the error is not solved try ...
2) Use only one and the latest jquery version on your system, and change all calls in phtml and css files to this file location. Rename the other jquery files to be sure only the unique file is used. As jquery should be backward compatible this should work but has to be tested.
To check which jquery is used try firebug with jQuerify, which shows you the used jquery version for your current magento page.