Hi

For some bizarre reason, the equations in powerpoint presentations are showing up as weird symbols. It was working fine one minute then went all strange the next. I don't know if I have pressed something to make this happen. I have run an antivirus so I know its not a virus or bug that is doing this. If I open up the equation editor, the equations go back to normal, but I have to do this for every equation. 

Any advice?

Thanks,

Jamie