Layout unstable when I switch from Raster to Hybrid

When I import a SU drawing into Layout it comes in as a Raster image. If I change to Hybrid one of two things happens. Crashes or the image becomes similar to a Wireframe image. i.e. components become transparent and show internal lines.
Inconsistent which drawings have this issue not all.
SU 2015 with iMac and MacBook Pro both on Yosemite and Windows Lenova . All three computers show similar