strange 'window' pull down menu

[plugh]

Upgraded a 20 file relational db to Fp8. After months of reprogramming and resetting of file references a constant problem emerges. Whenever I use the 'Window' pull down menu to select a file named 'Spline' it displays another file (the crime file). When I once again select the spline file (this time while in the crime file that it displayed) using the window pull down menu it displays the ptstop file. I have redone the file references with the same results. Note: script calls to this file (the Spline) work fine and all files are in the same local directory. What could be causing this?