Hellooo, I don't know if it has worked, but I have tried to upload the pic of my very very faint +. It was a little lighter than this, but when I took it out of the case to photograph, it went a little darker blue, this is about 5 hours later... but the + did come before 1 minute... so I am confused but thought I'd post anyway to see if anyone else has had similar or I might even be able to help someone in the future by posting this.
Mine was like that first time, then I tried the following mornin again and it was a bit darker. Then I left it two days and tried again and it was a definate +. Hope it follows this way for you too xXx