Compilation Error in asp.net website

I have a wierd problem so I immediately thought of Experts Exchange.  This is really interesting.~!@#$%^&*

I'm developing an asp.net 3.5 website.  I created a page "clinicEntry.aspx."  When I attempt to "view in Browser" a "Compilation Error" message is displayed in the IE window tab.  There is no stack trace and no detail, and no event log.  

Here's what I know.  

1)  In the development process I have created and deleted this page serveral times.
2)  I can build the  page and the code behind successfully.  I can also build the website successfully.
3)  The page has a master page.
4)  If I delete the page and recreate it with just a master and content blocks, no other markup or code, I get the error.  However if I go thru the exact same steps but save the page as "ClinicEntry1.aspx" I do not get the compilation error.

Thanks for your help.