My Application remains open after closing all forms

Hello my application will remain open after closing every form. This is a recent issue in previous versions my application would close. I call dispose(true) on all form closing/closed events. (some forms require it on closing instead of close because of some custom made classes.) Any ideas as to what could be happening?

Are you declaring any background threads in your application that might not be released?

I was in previous versions, but have commented that code out because it wasn't working properly/unneccesary.

It actually seems to run just fine on XP machines. The process closes after program exit. On Windows 7 however it will not.

Are you using any third party controls or libraries? Or calling unmanaged APIs?

To make sure that it exits you could run Application.Exit() in Form1_FormClosing
Although I'd only recommend it as a last option.

However, as said in the post above, if you are using any third party controls, you might need to unload these before closing your application.