The one thing that I have noticed and what may be happening here is how the file was created.

If Mr. or Mrs. customer created the file using points and you just open the file it will change it to points if it was created in inches it will open that way.

Now if this is just happening with your files then setting the defaults should do the trick.

There is also under TOOLS/OPTIONS/TEXT a section for default text units here as well. Once you change this be sure to save the defaults.