If you just got a new machine, then you should have purchased IBM software mtce. That includes supporline. Take advantage of this product and give IBM a call. While they probably won’t give you a workaround, they should be able to explain the differences and point you in the proper direction. Most likely, the solution will be simple. Also, check the IBM Infocenter website for specific details about iSeries Access, etc.
<i>Only Iseries interfaces activate the native Login Screen. WHY????</i>
Because your other software hasn’t been updated to current standards. The interfaces are published and available from IBM. It can’t be considered IBM’s responsibility to keep some other vendor’s software up to date.