nlapiSelectLineItem not looping through line items

We have some code that is supposed to loop though and update line items on an Opportunity form.  We believe the code was working the week of July 4th but have since noticed it’s failing.  After troubleshooting it’s looking like the code is failing because nlapiSelectLineItem is not looping though line items, instead it gets stuck on the 1st line item.  To prove it out, I created a simple loop and attached it to our test oppty form as a Page Init Function (code below).  When this code executes the focus stays on the first line item every pass through