I have someone uploading mp3 files to our site. She experienced some problems recently and asked that I check it out. I tried and had the same problems. I added the file with filezilla- and still was unable to see it online. I went in through filezilla and found quite a few instances of the audio file (some with different names) uploaded to the 2010 folder under 11th month! The date of last modification was the day she tried to upload. I deleted these files and tried to upload it again- I was successful using the browser uploader. It works fine but when I looked for the file in wp-content/uploads/2012/02 it wasn't listed. I checked wp-content/uploads/2010/11 and there it was- last modified date today- weird.
I also noticed that there are a few other files in there- 2010 I mean. We didn't start uploading mp3 until 2011. I have the media settings in wordpress ticked to 'organize my uploads into month- and year based folders.
Any help would be appreciated. One other thing I did notice a few weeks ago is that some of the files won't open in Chrome and some will. I just thought it was a Chrome issue. I remember seeing some of those that wouldn't play in Chrome in that 2010 folder. I still need to confirm that the files that won't play are in there.
Anyone else having this issue?