Media Library sudden directory problem

Hey all, it seems that my sites media library has a problem with case sensitive (Capital Letters) directory’s. This is the first time it has done something like this from around half a year of the site being uploaded.

I use the plugin “add-from-server” to add mp3s. Mp3 links now get a 404 page. It is because a file will be like this:

/wp-content/uploads/2012/01/DJ-Airecho-Lunar-Eclipse.mp3

When the original starts with lowercase letters like this:

/wp-content/uploads/2012/01/dJ-airecho-lunar-eclipse.mp3

Only about 5 mp3s I have uploaded last month work regardless of the capital letters. I tried to save permalinks and change and then re-save like I had it. I tried importing a wordpress save file I made last night, no luck.

The only thing I can do now is go into FTP and manually copy the capital letter files in the Media Library to the mp3 file names int he wp-content/uploads folder. It shouldnt be like this 🙁 something is wrong but I dont know why its like this. It shouldnt matter if the links have a capital letter vs. a lowercased one.

Any ideas? Hope I worded everything right and nothing is confusing.

site is http://www.electronicdancegenerator.com

Other nit-picky info:
I havent updated any plugins recently.