how to open a ppt/pptx file in libre office

when i try to open through libreoffice a ppt/pptx file, it does not do so but libreoffice itself crashes.I am also unable to export it as pdf. I am managing by opening in google docs but with undependable net connections in my area, need to save on my desktop. I am very frustrated by this as i did not have it in openoffice or neooffice [mac version]

often the presentations have charts and maps in colour, but even text alone gives trouble
hope you can suggest some solution.

padmini

So Liberoffice crashes when you open one of these documents? if so what is the error you receive?

Try to reset user profile as decribed here http://wiki.documentfoundation.org/UserProfile

which version or LO are you using and what is your OS? Are the ppt/pptx files created in MS Office or by a different application and saved as / exported to ppt/pptx?