I don't see how the VT60 would get fractures, the ZT60 it surely looks like it is pressure form the back panel not being correctly installed and when you look close there are no fractures in the glass, it looks like veins developing as the pressure of the glass is be separated from the panel and the adhesive is letting go. The pixels are fine they are distorted by the veins in the space between the glass and the panel. Since the VT has a gap between the glass an the panel I do not see how this would happen.
Klipsch RP-280F / RC-62ii / RS-35 / RS-25
Dual PSA V1800s