I am have a strange problem and have searched everywhere to try and find the
answer. Hopefully someone here has had this issue before and can help.

I have created an InfoPath form and currently ~150 users are using it. Of
those users 130 are able to use the form properly, the other 20 can't. The
problem they are having is that none of the controls seem to work properly.

There are 3 text boxes. Text box 1 and 2 you are allowed to enter a numeric
value, text box 3 is read only and sums up box 1 and 2. A working infopath
form would allow the user to click in text box one (which would then
automatically highlight the existing value) and enter in a value, after they
tab it would show up in box 3. For the users that the form isn't working
properly it doesn't automatically highlight the existing value and when they
tab over it doesn't automatically calculate the value in text box 3.

All users have the same security and are running the same versions of office
with sp2, .net framework installed to 3.0, and office pia files. I have even
done a reinstall of office and the patches with no luck

Any luck is appreciated thanks,