Maybe a clue for you guys ....
If I add LM13700N to the list, the link to the part works.
If I add PIC12F1840-E/P , it does not.
If I add MCP4821-E/P , it does not.
If I click the link and land on the 404 page for either of those last two parts, then delete the "-E/P" from the URL, I do land on the appropriate part page.