in the plugins page, under each plugins' name usually there are buttons/links like "Deactivate | Edit | Settings". Recently on one of my sites the "Edit" (and "Settings") button has disappeared. I have just "Deactivate" or "Activate | Delete".
My question is - what could cause this?
I am logged in as an administrator, so I should see the buttons. I suspect that something might have vent wrong with the installation of the last plugin but I am not sure.
Is there some scenario when these buttons get disabled (hidden) or do I have a bug / error?