Date saved in Sage notebook not updated

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I am using Sage 5.0 on a server. I use the notebook with Firefox 13.

Last Friday, I updated some code in a file from a while ago. I saved it. Today, I was looking for it and couldn't find it. The reason is, the date never got updated. It still says it was last updated 109 days ago and it's toward the bottom of the list of Active Worksheets. But, I opened it and it has the updates I made last week.

So, it's not a huge deal for me. I found it and my work is saved. But, just putting this out there in case it is a problem. Has any one else ever experienced this?

Just in case your first thought is, "Are you sure you updated it?", I know I did because one line of code I remember copying from another worksheet just last Friday. I hadn't even written the code I copied from 109 days ago. And, I ended my code with

for v in stuff:
    # Figure out what stuff is

and then on the bus ride home, I figured out what stuff should be.