Marquee tool edge thickness ? Anyone help

[vtivti]

Recently my marquee tool Edge thickness (the moving dotted line) had doubled or tripled in size. I cant find a setting anywhere to change this back and its making life awkward for doing fine section.

W7 X64 CS5.5

Thanks

[Hoogle]

try resetting the tool

[vtivti]

Didn't know you could do that! - but no Id didn't work :(

[Hoogle]

Ok try resetting your preference file
Close down photoshop
relaunch it from the start menu
Immediately press
control + Alt +Shift
whilst it is still loading
when prompted are you sure you want to delete the preference file say yes and confirm

[vtivti]

Ha ha - would you believe no that didn't work either?!? Very odd.

[Hoogle]

can you upload a screen shot this seems strange to me

[vtivti]

As requested. Ive tried to include other items for scale.

Thanks

[Hoogle]

Well I have googled this and cant find an answer a possible thing could be a change in your video graphics try turning of open GL

[vtivti]

Well done that man / woman - It was Open GL.

feeew. Thanks so much.

[vtivti]

Specifically Anti Alias guides and paths.