city of stpaul

I have a 5100 plotter . every time I run a job, it will do the job I ask but then it returns to an old job and continues cutting that one. No matter what I do I cant get rid that old job .. I've tried clearing software and even resetting the plotter .. cant get anywhere with this machine .. any suggestions???

Thank you for responding. There doesn't appear to be anything running in the back ground of this. I double checked all buttons and they seem fine . I've even disconnected power to the computer and the plotter still wants to just keep running that same job.. The software is gerber 5.0 wth??