START is now mapped to the TIMES attribute NCAP_START that was introduced in version 3.4.5.
You must use TIMES version 3.4.5 or higher with FE version 4.4.2 or higher.
Note that TIMES version is stored with case definition, so you will need to change it manually. An easy way would be to remove (or rename) all other source code folders apart from the current one. This way, the case manager would automatically choose the current source code for even old cases.