I apologize for not replying, but the truth is I don't have any good answers.
1. Application updates are very difficult to make right now. I no longer do development and we don't have any available engineers for this. At some point we will look into it, but I don't know when that will be.
2. The catalog has now been updated.
3. They changed the "libraries" that are used in building pI3, not the way that Windows itself works. So the code that created those previews no longer works. There may be another way to get them working again, but see #1 above.
The only official way to communicate with GenArts is to email support at genarts dot com. This forum is not the best way to reach us (as you've noticed). If you emailed support and got no reply, I want to know about that. We've got a very responsive, highly-regarded support team.
(And in case you're wondering, I'm working on the Q3 emitters, but I'm a bit rusty so it's taking longer than expected)