The GUI is programmed, and rightfully so, to not allow changing the Title to an invalid filename. This is not a problem if you are manually typing something. However, if you have copied a Title from elsewhere and try to paste it in the GUI and it represents an invalid filename, it simply will not allow the Paste to occur. This leads to having to either manually type in the information or paste the data elsewhere, correct it, then copy and paste the corrected text into the GUI. This is both a pain and inefficient. If you do the same thing in Windows by trying to "rename" a file and you try and paste an invalid filename, Windows strips the invalid characters and pastes whatever remains allowing you to reject, accept, or edit the resulting paste operation. I propose the interface be modified to adopt that behavior. My most common problem is copying a quotation mark(s) and DVDFAB will not allow the paste to occur. Of course being more careful with the copy prevents this, but it's nice when the software helps when we make an error.