It's 2 files from zen-cart that are interfering with one another. The zen-cart writers say it's the space at the end problem causing the conflict. Apparently it's common in these two files.
...

After the last ?> in the code, there is extra "space" like as if you used the space bar or tabbed over at the end of the script. I go in and delete it so that the cursor ends like so ?>| and it...

Somehow my code keeps getting extra spaces at the end after the last ?>

No matter what I use, or what I do, I keep getting it and it is causing function errors.

Any suggestions??

Thanks!