The only thing I can think of is if the wrong standout(s) are on the block or aren't fully seated or the wrong length screws are used. This may cause some tweaking and cracking of the PCB/chip and it's connections. Always make sure the stand-offs are fully seated with a pair of pliers and and they are all the same height. Whenever I am done with a WB install I always take a high powered flashlight and give it a once over around the entire edge where the WB/PCB come together. I too use PK-1 on all of my installs, all over the VRM area etc and my four cards work great. It is non-conductive.