This is common and has nothing to do with SF.  If you search through the forum you will find that I have answered this more than once before.  It has to do with the AppDomain and the loaded assemblies and the recompile and run attempting to reload the assemblies into the AppDomain.  Close it, re-open it, and it is just one of those things you will have to learn to deal with when using the VS environment.

I have a form which works fine but after debugging the application, when returning back to VS2008 IDE if this form was open, I will not be able to view the designer controls in the form and get the error attached in the image.

By closing the form and openig it again, I am able to keep working in this form.  This does not happens with my other forms and I am affraid the form may get corrupted and loose it.

Is there anything I can do?