Thank you for your concernd MUFFIN,immediately I open my project it brings like INVALID FONT SOURCE SANS PRO REGULAR
.................................................AND OTHER FONTS
the software is too slow,i cant even play aquater of the timeline before stoping for some 10 or so minutes.Before I thought it was my memory and I cleaned the cache memory but it still doesn't work.thats my major problem.i wonder whether the font staff can make it drug/slow down.