@d-healey Just the one (develop). OK since your first comment, I went and deleted the vst and asio folders and unipped the sdk folder... No idea why, or how it made any difference, but it did! Just compiled successfully. I think I must have missed some updated docs on the sdk setup, I didn't realise they could ship with HISE hence why I discarded the included lot over the separated downloads... all good now, thanks as always!