Hey PG,
with WL 8.5-64 Bit my UAD Plugin are not loading. 
When I start WL 8.5 in 32Bit mode the UAD Plugins are being shown correctly.
There`s only one installer routine from UAudio for both.
What Am I missing out?
Thx,
Stan
Windows or Mac?
Win7 - they show up in C8-64Bit as they should.
My only guess is that the 64 bit plugins are not found. And the 32 bit are found but rejected, as not 64 bit.
Verify the reject list in the WaveLab plugin dialog.