I'm simplifying this untill someone asks for details.

I have a parametized view that I've been using for 1 1/2 years with no problem. All of a sudden I'm getting "view definition has changed" SOMETIMES when I try to open it.

One of the parameters is "cs_Date>=?pdBegin and cs_Date<=?pdEnd".
I've discoverd these results:

pdBegin    pdEnd     Results
Single Date Range
{4/3/2}    {4/3/2}   Opens
{4/4/2}    {4/4/2}    Error
{4/5/2}    {4/5/2}    Error
{4/6/2}    {4/6/2}    Error
{4/7/2}    {4/7/2}   Opens
Multi Date Range
{4/4/2}    {4/10/2}  Opens  
{4/4/2}    {4/5/2}   Opens  
{4/5/2}    {4/6/2}   Opens  

I've tried reindexing the table.
I orginally guessed that I had corrupted data, but couldn't see it. But no other form or report or browse has a problem with the data. I haven't started trying to track down a particular record that might be causing this, but after those last two results, I'm wondering if it's even worth trying.

TIA