I attempted changing the name using every possible combination (referring to case (AMF, amf, Amf, etc...)). I also tried to 'save as' an stl file, obj, dxf, etc... As soon as the save function executes the file becomes 'missing' from the interface, and a question mark appears. The software seems unable to open its own file extension.?? I have been trying to read through the forums, faq, and the tutorials, but I don't see any other issues like this. Perhaps it is something with this OS. I may install another version of the OS, or Windows in a virtual machine and see what happens. @unlimitedbacon
I will also tweak, where possible, the interface and see if that results in any changes.
Thank you for the quick suggestion.