I’ve just found out that the same issue also occurs in Yosemite latest version 10.10.5. The difference is that it only appears very fast about less than 1 second. I tested by uninstalling driver version 1.9.6, then try the older 1.9.4. Nothing happens after that. I still think the problem is the compatibility of new driver 1.9.6 that released in 2nd November.