No PDF preview in LyX: "Error converting to loadable format"

the Tools->Preferences dialog and the Converters pane, but no luck here. Is there a way to get around this problem or is it simply a bug? Best regards Bjørn Liene Gundersen

Where to get an overview over possible key-binding commands which is not pre-defined?

? Does it exist a map of possible key-bindings commands? Thanks and best regards Bjørn Liene Gundersen

Distribute the title (frontmatter) over several lines separated with line space?

more dark/clear? Best regards Bjørn Liene Gundersen Master student at Telemark University College, Norway.