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What you're seeing is a spatial interpretation problem. You can solve it two ways. The first way is to make your keyframes visible in the composition window and then hold down the Alt/Option key and click on the problem keyframes. (I hope I'm remembering the right shortcut for 6.5. You might have to select the g key then hold down a modifier key until you get the open carot > icon). This will convert the spatial interpretation to linear.
The other way is to select both keyframes, or all if you'd like, and change keyframe interpolation to linear. Check your 6.5 help files and search for spatial interpolation. You'll find a lot more info.
Actually, the After Effects 6.5 Help document was quite sparse on this issue. The basics of the application in this area haven't changed between 6.5 and CS4, so reading the After Effects CS4 Help section about spatial interpolation should help.
Here's a Community Help search for 'boomerang motion' that brings up several threads in which this issue and its workarounds are discussed.
Thank you both very much for your help. I was able to correct the problem.