Klaus1, Thank U for getting back to me. To answer your questions I have Mac OXS and run 10.7.5. I decided to turn my computer off last night and after about 30 minutes restarted it and it was working fine. My Mac Book Pro is old and I have procrastinated on getting a new one. I am a flight attendant and have taken pic's & videos all over the world. I then take those pic's and turn them into incredible imovies. That being said I have really been putting in overtime getting caught up with my videos so I think I have to admit if I can get through this busy season it is time to think about upgrading in the spring. I luv my Mac but we all get old.
Thanks Again!