View History missing in SharePoint 2010

Has anyone experienced this?  I can't find anything on the web.

We just upgraded from MOSS to SharePoint 2010.  Our site collection consists of thousands of subsites using the same workspace template. My subsite all contain a library called Reports, which has Versioning enabled. The home page of each subsite has a web part for Reports where I can see the document menu for uploaded documents.  In MOSS, I can view the version history on the document menu for an item in that library via the home page web part.  But when I convert those sites to 2010, the Version history option disappears from the document menu.  BUT, it is only missing when viewing a document in the web part on the home page.  If I open the library (//server/project/Reports/Forms/All%20by%20Group.aspx), the document menu then shows Version history.  This is very strange.

Milissa Hartwell