Yes, i tried several liveries that were working fine before i updated to P3Dv4.2 and FSL A320 v2.0.1.231. All of them now show Jet Aviation ULDs
The thread you linked is from P3Dv4.1 times, when it was working for me.
It still works fine with the PMDG 747 so it must be something with GSX and FSL A320. I also ran the live updater to refresh the GSX files, but no luck
Are there any logs that would help to pinpoint the issue, i.e. indicating on what criteria GSX bases its choice to use Jet Aviation? Am i assuming correctly that GSX will use the generic Jet Aviation texture if it cant find a respective texture for the currently loaded livery?