it seems that apple are finally removing the Carbon Component Manager from their products in 10.13. This has been warned since the 10.7 sdk which introduced a new entry point for audiounits.
As far as i can tell this means current IPlug plugins won't load in garageband or logic on 10.13 although they show up in auval, making me think other hosts might be ok.
Thanks to some funding, I have implemented AudioComponent support in wdl-ol and will roll it in shortly.
https://developer.apple.com/library/...76/_index.html
https://developer.apple.com/library/...47/_index.html
just a heads up that you may want to delay any updates until you can include this!