Several people have reported issues with Scott's 1000 sheet toilet paper (the last safe toilet paper from the list). Scott's, it seems has recently "improved" their product and it seems the improvement might be corny.
The search is on for a new safe toilet paper.
For more information on this discussion, please visit Delphi Forums: Avoiding Corn.
Newer update with information from the company: "We use a dusting of corn starch on the inside and outside of our poly wrappers to facilitate the packaging process. In addition, the packaging material of most of our products and the cores of our rolled products are made from recycled materials, and most also contain corn starch based adhesives."