I installed the newer AUs.
The effect plugin loads into Ardour. I can open it and load a .csd however there is definitely a windowing problem. I've only had a brief chance to try it out but it seems that if the GUI fits in the initial window it's ok, but if the gui has to expand or scroll it doesn't display properly. it only shows a portion of the GUI.
Logic Pro X appears to be similar. The effect plugin loads and I can load some .csds but some are causing an instant crash. For example, BounceDelay is fine, but CompressorExpander causes an instant crash (the plugin window appears to resize then boom!).
The synth plugin still won't load at all. It doesn't appear in Ardour's plugin manager or Logic's. I think the error is different this time so I'll post it again:
AU Synth Error