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  • Welcome to TeX.SX! What you report are normal warnings that can safely be ignored. Maybe there's some real error message below them Commented Oct 15, 2016 at 13:48
  • I couldn't see anything obvious or flagged as an error, unless this is one: Underfull \vbox (badness 10000) has occurred while \output is active [] Commented Oct 15, 2016 at 13:53
  • Do you get an error from a simple "hello world" document? If not, then try to narrow down the beamer manual until you figure out what exactly cause the preview not to work. This can take some time. Commented Oct 15, 2016 at 14:21
  • Might try this: Instead of compiling from within Lyx, use Windows command box, and issue the pdflatex command (with path) from there. It might possibly show Windows errors that Lyx or the log don't show. Commented Oct 15, 2016 at 14:57