Thanks for the responses. No real mouse attached, just phantom touches to the screen. After posting I power cycled the pi a couple of times and on the last time it came up with the rainbow on the top right of the screen and kept flashing on and off. Starting to think the 2amp psu isn't really puttin...

Hi, I've just got my new raspberry pi 7" touchscreen display running and I'm finding that the pointer on the screen is always moving all over the pace making it almost unusable. It's running on a clean install of Jessie, all updated etc... Just wondering if this is a common thing/software bug or som...