AutoCAD Inventor :: 2014 New Install - Missing Green Dot And Invisible Icons In Nav Bar

Have installed inventor 2014 as part of the Product Design Suite Premium 2014 & have a few issues.

1). In sketch mode when drawing a line/circle etc there is usually a green dot in the centre of the crosshair, this is not vissible at all making it difficult (if not impossible) to see where the cursor is snapping to. The same happens in the drawing mode when dimensioning. I've checked the options but can't see anything obvious.

2). The icons in the 'Navigation Bar' are invisible, I've checked the opacity levels & irrespective of the setting they are still invisible. You can hover the mouse pointer over where they should be & they work, they're just not visible.

Also, the close, minimise & restore down icons in the top right corner are also invisible. Similar to the navigation bar issue, they work, they're just invisible.

Have tried uninstall & reinstall, & have downloaded & installed the update, but this doesn't solve these issues.