Backup sets jumping around

Hi Guys, I have this problem where I am attempting to select a number of backup sets from my dedupe store to run a duplicate backup to tape.

BUT... one backup set appears then disappears, then appears then disapears. This means I cant select any backup sets for less then a second as it becomes deselected almost immediately. Sometimes if I make sure the interface is not maximised it works for a while but not ever time.

I've seen suggestions to go the the server itself and select the backup set from there but its just not feisable timewise.

Any suggestions?

Calis