I was taking a lab and came accross a weird scenarios that I don't have an answer for. The router would accept the "router rip" command, but I noticed that it wasn't showing in the running configuration and rip wasn't routing. So, the router would take the command, but it really wasn't. The router would take the "router ospf" , "router eigrp" or any other command and it would show up in the running configuration. Finally, I found a weird file in the flash that I believe had a .sfg extension and had a number in the file name, something like 512 or 576. I deleted that file and rebooted and I was then able to configure router rip and it actually worked.
Has anyone seen this before?