Garbled/scrambled text with Air for Android & GPU mode

Please excuse the big image! Has anyone come across this? As you can  see the 'U' in 'Nebula' is scrambled and so are the digits below best  time.  It only happens within  the space a character would occupy. The line under 'game' is just a reflection.

I can't work out what's causing it, it's not always the same  characters that do it although the U in Nebula is always scrambled.  Sometimes digits are scrambled and sometimes the same ones are not. It  seems to occur with embedded fonts and with normal ones like Arial. I've  tried using both Classic and TLF text, and changing anti-aliasing  settings. It occurs on both dynamic and static text.

But it only happens  with GPU rendering, not CPU rendering.

I can't find any mention of this at all on Google, starting to wonder if perhaps it's just my phone? (Desire S).

Any input is greatly appreciated!