I just checked and mine (other than AITB) are still working in side-chain in Reaper, so maybe reinstall your libraries that don't work....? I have no idea since I use the same software and am not having issues like that. A reinstall is always my first effort.
Here's a post of Giancarlo from the above link (page 4, middle of the page):
giancarlo wrote:here you'll find attached patches coming from mplay for most of compressors, for the exception of programs coming from alexb (he said he will generate/test/release this kind of patches in a different way).
MANDATORY nebula version 1.3.502. I released version 1.3.502 for windows today, I'll try to release 1.3.502 for mac in the evening
Anyone can chime in? Do we need to do something "special" in Nebula to make it work?