I am facing problem with document check out in a SharePoint document library. This is the message I am getting:
I'm using the out of the box document library.
I have logged on as Admin
Document is not already checked out
I have tried creating a new document library
I have tried creating a new site collection
Check out works with Firefox but not IE.
No 2003 products are installed. This happens with all users. When I check out a document in-place (locally), check out works fine... This might be an IE problem...
When I installed a new web application the problem disappeared... But I still don't know what broke it...
Any other file types check out fine but docx/xlsx/office related types won't check out....
I have narrowed the problem to the web.config. Somehow its settings breaks libraries checked out in Internet Explorer.
I tested it with my original web.config on a new web-application/site collection and it worked fine. As soon as I updated my other web.config to the correct one checkout doesn't work.