I have uploaded wig files to UCSC since last year and of course before that I signed in to make the link permanent. yesterday when I wanted to check one of the experiments (that I made the link for 5 months ago), I could check the link but no data was there. and the point is that I checked the same link last month and everything was Ok. to find the problem I checked other experiment's link, they have the same problem meaning the data is not there but the link still works. I know if you do not sign in and just upload your files the link would not work after a couple of weeks but I signed in and also in this case my links work but the data is not there. I also never removed them.