On Thu, 31 Mar 2016, Neal Becker wrote:
The problem is coming from pdf drawings which were created by lucidchart (online).
Not sure yet what to do about that.
Neal, You can use ghostscript to convert pdf to jpg (vector graphics to raster graphics), or use pdf2ps then ps2eps to get an encapsulated postscript file. I _think_ lyx accepts .eps images. Rich