OpenGL variances run under XP and Win2000

Transparency and rendering are different in XP and Win2000. Has anyone else come accross this before?

In my scene i have 3 objects dispersed in line. the central object is solid the other 2 are 50& transparent.

When i look through the central object at one of the extremity objects, in one direction i can see through the central object and see the transparent one but not when looking through the centre at the other extremity object. This does not happen when run under Win2000.

Another manifestation is that the solid box shows as an open top box with its front face transparent again this is not displayed in this way under win2000 OS

Any ideas?

Attached are 4 Pictures

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