Edit - Issue was with one of the layers, deleted all layers aside from base layer and re-created them in SL3, seems to have fixed the issue.
Anyone came across this issue yet? I've tried publishing in all available formats. When in preview for desktop viewing it just buffers constantly whereas previewing in other formats just displays a blank screen.
For arguments sake I've uploaded the SL2 file, in case anyone would like to try and replicate the issue for themselves or spot something in the SL2 file that is causing the issue.