Yes, this is the problem.... powerstore was built with the earlier version of Digital File Pro, and you have an older version.
That means that when you apply the old version on another page in the site, it will replace the include file to the older version. The solution is to either:
1) upgrade Digital File pro to the newest version
2) get the include file from your powerstore download... rename it with v2 at the end and update the include references on the product insert and update pages.
This way you can use the old version on other pages and not have to worry about it overwriting the files used by the powerstore.