InfoPath Dev

I am trying to make a modification to a form that i designed. typically there are no issues with doing this, but today for some reason when i went to perform this function it gave me an error message saying "infopath cannot load the view.the view may have been modified to contain unsupported HTML such as frames". i am running windows 7, microsoft office 2013, on a Dell AIO. could someone tell me how to fix this?

Oh, there is a thread on that somewhere on the forum - but I think most of us found that resizing our InfoPath window and retrying opening in design mode eventually allowed us to open. At some point, a windows update fixed this for me..... But I don't know which one & am on Windows 10. http://www.infopathdev.com/forums/t/28126.aspx?PageIndex=2