yum check-update on FC7 returns nothing
 

Attempting to check what packages have updates available through "yum check-update", nothing is listed as available. No errors during repos retrieve yet comparing installed versions of packages against what's listed on download.fedora.redhat shows version differences.

What would cause yum to stop referencing available updates?

Upon install and initial update of system, everything was good...it's been over the past couple of moons that "yum check-update" returns nothing yet still able to retrieve information about packages.

Any help with this is greatly appreciated.

Support for F7 was dropped a couple of months ago. There will be no further official updates of any kind.