According to the official release notes in PDF format, only two issues are currently known to NVIDIA in build 535.98 namely flickering in Watch Dogs 2 and increased DPC latency which have been ongoing for some time now. But in reality, NVIDIA is aware of many more bugs and only mentions them, for some reason, on its discussion forum. A good dozen bugs are actually currently being studied and in the process of finding a correction in the more or less long term.