In SP Foundation, I have the standard, out of the box shared documents in the team site at the root. It is an external facing site using ssl.
I am using PDFs. The Adobe IFilter has been configured correctly because I can see the acrobat icon in the library and in search results.
I've set the library to require checkout, but when I go to edit the document, the ribbon for edit is disabled when the doc row is selected and blue, so it's not a context issue. It's not a permissions issue because i am the site collection administrator. When I attempt to use the item dropdown, no edit option appears, only checkout. I used to be able to click on the pdf title and it would tell me that I am checking out and editing and gives me the save to local drafts option. but that no longer works as well. Now it immediately goes into download mode without checking out. I am able to edit it in Acrobat XI Pro and it has an option for saving files to the web and apparently it saved that sharepoint address and allowed me to browse to it and save it there. Nice feature. And it even saved it as a new vewrsion with the changes reflected in it.
So I am mistakenly able to download, edit and upload without and check out or checkin being required even though it is clearly set to require it. How can that be?