Thanks for the nice words, Stephan.
One has to say in general that Laminar does work fairly well and close with developers. They have a Slack channel for devs and will answer questions and requests there frequently and timely.
In some cases the problems that add-ons (and even default X-Plane) encounter are so hard to figure out and affect so few people that it simply is not economically viable to pour a lot of effort into solving the problem.
Often it turns out that it is actually the "fault" of the hardware manufacturer of some component, the user misconfigured their operating system or some other freak coincidence and Laminar and everyone in this business to make money have to decide if they want to assign a specialist for possibly weeks of man-hours to try and recreate, get to the bottom of and finally fix a problem that more often than not turns out to be not Laminar´s fault.
Laminar´s support is already overwhelmed by requests from users that have a hard time finding the power switch on their computers (for some reason flight simulation is an area that suits geriatric users especially), and everyone has the attitude of "hey, I spent 59 dollars on this, now help me put this here compute together, install Windows, X-Plane, all of my add-ons, and teach me how to fly an A330, too!"
In this special case Laminar (rightfully) shrugs their shoulders and says "well, we do not support OpenAL, so this looks like an OpenAL problem so we are out of it". If EVERY user of our 737 had this problem we would probably have a case where we could go and say "hey listen, we have thousands of users that can´t fly this add-on and will hate X-Plane for it, we need some help in figuring out why OpenAL crashes your code". But with only 2 or 3 out of thousands of users, it is more than likely that this is caused by some weird combination of hardware and software that is very infrequent.
As cruel as that may sound - unfortunately you and the other guys suffering from this sound problem are too few to really set a big effort in motion to fix this, especially since the obvious way out of this is to convert to FMOD...
I personally believe that if you had a computer with different sound hardware, things would work just fine - maybe you can try to install the IXEG on a laptop (you have 3 licenses to install on different machines) and see?
Viele Grüße, Jan