mantra child theme problems

I created a child theme for mantra on my local host first. Everything worked fine for a couple days and then all of a sudden the child theme would not work right. Seems some css styles from the parent theme are not loading. I tried it on the live site and the same thing happened. My style sheet is the following with no new styles listed:
/*
Theme Name: Mantra Child
Description: Mantra child theme
Version: 0.1
Template: mantra
*/
@import url(“../mantra/style.css”); /*include parent theme css*/

I have worked with several themes and never had this happen before. Any ideas?
Thanks.