Tempo scaling in Cubase 5.5.2

I’ve been used to using the tempo scaling feaure in SX3; in the ‘Process Tempo’ window I’d hit ‘Tempo Scaling’, type in a number and all of the tempo map would be scaled accordingly. I use this when I’ve got a complicated tempo map in time to a piece of audio. After timestretching the audio, I need to change the tempo map by the same ratio so that the click track is still in time.

Having recently upgraded to Cubase 5.52 I’ve found that the ‘Tempo Scaling’ dialogue looks the same, but clicking on it doesn’t allow me to type in a scale factor. Has anyone got any idea if this is a known fault or if there is a workaround?