That would seem to be an over current condition. The change of a few degrees shouldnt be enough to melt the plastic on the fuse unless you notice that the case is getting really hot. Then you should check that the fan is running. Dogie has some info about reversing the fan for better air flow but i would suspect that the fan is not running and thats what is causing the build up of heat, the other option would be that the socket for the fuse is loose and causing high resistance. Was there a good amount of resistance when you replaced the fuse?
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Fan was running when I found the fuse like that. Could have stopped at some point and started again? I had trouble pulling the fuse out and had to use pliers to get it out. I had all the power disconnected at the time. It was also difficult to push the new fuse in.
I thought this was weird though. I plugged the miner back in without the fuse and the fan kicked on. Didn't mine though. I turned it back off and put the fuse in. It started mining. Is that normal?