Problem burning to DVD-R but not DVD-RW

I've been using Intervideo DVD Copy 2 successfully on my main pc (Pioneer 107).

I've not got a second PC with a Sony DW-U18A and am having problems burning a movie. It works fine on a DVD-RW (which I used to test that all was ok) but when burned to DVD-R the copying finishes without errors but the disk is unreadable (tried both DVD durners & 2 DVD players).

Tried two types of DVD-R (both Ritek dye), 3 coasters so far could do with some help before I've got a pile of them!!

Any suggestions?
 
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