Comment 1 for bug 486141

1) Could you please add information about your Inkscape version or revision number (see Inkscape menu 'Help > About Inkscape')
2) I assume you are not trying to save a document as 'Desktop Cutting Plotter (R13) (*.dxf)' file when the error messages are popping up?
3) When this happens, do you have a java-based download manager running in the background that monitors the clipboard (e.g. FreeRapid or jDownloader) or a clipboard manager?