Ok half my own fault this issue, I've raised a support ticket, but thought I'd put it here in case anyone else has done this.
While installing the downloads the first one I downloaded was 'SampleTank 4 MAX Instruments' I foolishly assumed that this was some sounds and when I tried to play any ST4 instruments it threw an error about the files not being there... So I installed SampleTank 4 MAX Instruments again... still no sounds, so for good measure I installed it again (I was excited ok).
I then realised that this file must be like an index of instruments. When I then did start downloading and installing more stuff I realised that every ST4 instrument was now listed 3 times in the instrument browser. Does anyone know of a file that I can delete to reset this instrument list and re-index or similar.
Thanks
[mod redacted: Unnecessary, uncivil, and please review other rules]