Your ticker may be from one of the ticker websites that are banned due to many issues including viruses and such. I don't see anything in your signature but the X, usually it shows the ticker address with some *'s blocknig out some of the address like this
www.xxxxtickers*****, but I don't see that.
Try clicking on 'tickers' in the blue bar at the top of the page, above the yellow bar. You can create a new one that will work with the Dis. Then go into your signature and update it.