Problems getting files to open in browser from SP 2010 search results page

We are in day 4 of having upgraded from MOSS 2007 to SharePoitn 2010 via database attach.

When a user looks in their document library, and clicks on a PDF, they are asked if they want to check out and open or just open, and when they make the selection, acrobat reader opens the doc.

When a user performs a search on the same library, and clicks on a PDF in the results page, the user is prompted if they wish to download the file, and then, after they save it, the file is downloaded and nothing else happens.

The users do not want their disks filled with unnecessary copies of files.

Note that I did add an "application/pdf" mime type to the allowedInlineDownloadedMimeTypes property .

This is only occuring when using the download results page.

Does anyone know a fix for this?

Thank you.