Sequence preview fine but...

[SusanPT]

But when I try to do either preview from top menu or export video I get a blank screen with nothing on it...the file size is only 10 kb. Clearly not picking up anything at all...Do I need to do something first once the sequence is fine before previewing or exporting..?

Thanks and sorry if this is an obvious question..

Susan

[Baldrick]

And you are using?