Self-service software fail, ver. 2

Early this year, the Home Depot near our home installed a self-service propane bottle exchange system. I tried it out, it failed, and I documented my experience on this blog.
A representative of Amerigas found my blog post, and contacted me about my experience in order to troubleshoot the source of the problem. I thought that was kind of cool.
Well, since several months had passed, I decided to try the self-service propane exchange again. I figured enough time had passed that the kinks had been worked out. To my surprise, I had almost the exact same experience again. I took my empty bottle but failed to open a door to a cage containing a full bottle. The only difference this time is that it apparently didn’t charge me. The receipt had ‘void’ on it.
So, I walked into the store and got in line at the service desk. While waiting for something for the person currently being helped, the service desk employee looks over, sees me holding a small scrap of paper and asks if I had trouble with the propane. He re-runs the purchase and then sends another employee out to the propane system to help me get my full bottle. With that employee’s help, I got my full* bottle of propane from the ‘self-service’ system.
I can’t believe that they’re still having such problems with the self-service propane bottle replacement system.
* ‘Full’ is a relative term. You used to get 20 lbs of propane in a full bottle, then it went down to 17.5. The bottle that I got only contained 15 lbs of propane.
NOTE: If I were WebRaiser, the company that apparently created this self-service system for Amerigas, I might want to take down my case study of the propane bottle exchange system. I’m sure the employees of my local Home Depot would disagree with this statement from the case study:

The “Big Box” home improvement stores will generate a quick financial payback. Although the specific ROI data is confidential, the labor cost savings are compelling. By capturing all transactions, the inventory shrinkage problem is virtually eliminated. The Dekko-matic also reduces restocking and logistical costs through its automated inventory control and re-ordering capabilities. (emphasis added)