On Thursday - exactly two weeks after the first OS X 10.10.2 beta - Apple updated developers with a second beta, build 14C78c. The primary focus from the previous beta, Wi-Fi stability and connectivity, continues to be the requested center of testing. Specifically, Apple is asking developers to test recent changes made to Wi-Fi interaction. While the first update, 10.10.1, fixed a number of issues users were having with Wi-Fi and Mail issues, some users continue to report problems with Wi-Fi stability.