How do I get objects to move in a linear fashion again.

I have recently upgraded to Blender 2.6a from Blender 2.59. I was in the middle of working on an animated clip involving a robot character that I have created. When I installed the new version I ran into a problem as I added new keyframes I couldn’t get it to have extended still periods. It seems to be following some form of quadratic or at least non linear path system. Basically when in the past when I would enter a location keyframe and then move forward a few steps and then add an identical key frame the object would stay in that position for the duration. In the new when I follow the same process it has a slight drift continuing along its former path. Is there some setting that I can change to set it back to a linear keyframe system or do I just have to add a whole bunch of duplicate keyframes to get the object to remain stationary.

Also in trying to work on the animation I saved it and it is now doing the same thing in blender 2.59 for that specific file so I am thinking that it is a setting that got changed.

Any advice in this area would be much appreciated.

If you don’t understand what I am talking about let me know and I will try to explain further and or add an image or clip to demonstrate what I am talking about.

I just select all the keys.
Press the V-Key in the graph editor or dope sheet.
Choose Vector from the menu that pops up.

If you want to always work in Linear you can also set that as your preferred default under User Preferences

Also never use ‘save’ when saving a file… aways use ‘save as’ … when you ‘save as’… there is a ‘-/+’ button just left of the 'save as Blender File button in the upper right corner of the file browser that comes up when you do a save as… hit the ‘+’ button to add a number extension to your named file so that it does not over right your original file… you should end up with multiple files with number extensions on them… file_001.blend, file_002.blend, file_003.blend… etc… and you can always go back and delete the old files when your confident your not going to need them any more or after you back them up to a CD or something… Also remember that blender by default automatically saves a couple of copies of your files while you work… open up the directory where you saved your file and see if there is not a "origonalfilewhateveritsnameis_003.blend1 is there… (note the 1 or 2 will be after the .blend part not before) just rename that flie right there in browser taking the 1 or 2 off and you should have your original file back…