Server List Deleting Constantly

Pretty much every single time I open up my Multiplayer servers list, they delete. This includes when I:
-Hit refresh,
-Go to the Main Menu selection screen and then return to Multiplayer
-When I come off a server
-It even happened when I just added a new server
Pretty much all the time, no matter what I do. I even tried to go into my .Minecraft folder and change the servers file from a .dat_tmp to a .dat file, but still no luck. (I also did this while the same Minecraft was open to see if I could recover the ones that I lost- still nothing.) This issue was frustrating the first couple of times, but now, it's just getting unreasonable to have to re-add the servers every single time. Hope this gets fixed soon. Thanks.