[NTG-context] "Please fill out the following form"

I was creating a document with many hyperlinks and tooltips, and everything was working, until it reached a certain size. Two strange behaviors began: 1. At the top of Adobe Reader I get a purple band that says "Please fill out the following form..." 2. Tooltips no longer appear at the first rollover. Instead, a pale blue box with a checkmark pops up. On the second rollover, my tooltips appear as normal. Is this some limit inherent in Context, pdf, or Adobe Reader? Is there a way to work around it?