Hi Frank,
I’m simultaneously in contact via email with Dave about the same topic, and I strongly assume you’re from the same team, am I correct? 
I am replying here rather than via email, as the preferences configuration on the KNIME Server unfortunately often causes big troubles, confusions, and frustrations for our clients and I’d like to have this topic visible to the public (and the KNIME company).
@ KNIME forum administrations: With that in mind, I think it makes sense to move this back into the “KNIME Server” category where it was originally created, as it is a KNIME Server configuration issue and not specific to the Selenium license.
Based on the steps you highlighted in the email, I do not see any obvious issues. Yet I can recommend to have look at this thread (never mind that it’s talking about “Palladian license” - the principle is the same):
Note that the file paths mentioned in this thread are different to the ones you mentioned in the email, so I guess it’s worth double-checking.
Unfortunately the user didn’t provide any details back then - it was rather a trial and error (similar to the thread linked above).
Independently from that, I have another suggestion for a workaround - let me get back about that later here!
Thanks,
Philipp