Lightroom divides the image into blocks when applying develop adjustments after last update. Image opens fine, click on Develop and it still looks fine. Go to adjust anything, say Exposure, and the image jumps into a puzzle of blocks. When I release the mouse from making the adjustment it reverts back to normal. What gives Adobe? Been using LR since day one. Release 2015.7
Try turning off graphics card acceleration in your preferences->performance. This sounds like a problem with your video driver and Lightroom and is unfortunately not uncommon.