Information in fields dissapearing RB 3.0.1

I thought I was going mad after filling in the artist field of 10 tracks, then going back later and noticing it was blank, then I saw it happen in front of me in other fields.

If I enter something in a field such as artist and move to another field by pressing the mouse, sometimes the artist field will blank out !

It also happens if I remove something from a field, ie comments, and then click in another field, then the comment will re-appear.

Both of these work OK if I tab to the next field.

Tabing from  Label to Genre doesnt work