I have used Libreoffice Impress to give presentations at meetings for some time now. The current version of Libreoffice in Ubuntu 12.04 is 188.8.131.52 and this works fine for me. Recently, following a recommendation from a colleague, I installed Libreoffice 4.0.something using the Libreoffice PPA. This worked, but I discovered when going into slide show mode most of the graphics (line graphs) disappeared, even though they were perfectly visible in the original. Lettering, drawings, and pictures came over, but not the line graphs (which were originally inserted in .eps format most likely).
With some effort I managed to uninstall the more recent version of Libreoffice, and reinstall the version in the Ubuntu repositories (184.108.40.206) and the graphs now appear as expected in the slide show mode. Is there any explanation for this behaviour?