Hey, doarte! Did you initiate the process of uploading an image, and then hit the 'back' button on your browser without pressing the 'cancel' button on the upload page? (It might even say "abort" instead of cancel, or something similar)...

I did that once, and when I tried to upload my image again, I got the same message you mentioned. If you begin the uploading process, there is a specific way you must cancel it if you change your mind. Otherwise, the gallery software will process it as your allotment for the day. : )

If you didn't upload anything, or even attempt to, then I'm sorry, I don't know what else could have happened...