When adding a printer and it has a space in the name multiple printers are created.
For instance if a adding a printer wit the name "Kalle Anka". Two printers will be created, one named "Kalle" and one "Anka".
Similar problems occurs for rename and delete printer.
This is applies to PDFCreator 1.9.5
I have a patched version of ApplicationSettingsWindows.xaml.cs if interested
/Jakob