Looking at the screenshot, I would just say that uncheck both the date check boxes - Beginning backup date and Ending backup date.
See if you can see all the resources for backup and check each server by date you expect to see. I would say maybe comp...
Is this an intermittent issue?
When you say some PC's backup dont work, do you mean that they have never worked (as in never been backed up as per schedule) or they do get backed up sometime?
What happens if run a manual job - do they backup?
Can put the remote agent in debug mode and post the log here.
1. Stop the Remote agent service on problem machine
2. go to properties of the service. In 'start parameters' box type -debug and click on the Start button.
3. then from the Backup serv...
