Mac OS X limits the amount of open files (file descriptors) by default to 256. This sometimes causes certain applications, such as Oracle MySQL and certain Java processes, to show errors like “too many open files”. You can check the current maximum open files limit in Terminal by typing the command below.   launchctl limit maxfiles...

What is It? System Integrity Protection (SIP) is a built-in security mechanism that helps protect your Mac from unknown processes and applications from modifying or accessing certain directories and files as root. Read more here.   Why Do You Need It? By protecting root files and directories, Mac OS helps ensure integrity and protection of the...

Are you suddenly getting messages to sign in to your Apple ID on your Apple Mac device? If you click “cancel”, the messages persist and you cannot back out of them. Some of the Apple ID sign-in messages may include:   To continue, sign in with your Apple ID   Update Apple ID Settings Some account...

When you open a video file (MP4, MKV, MPEG, etc.) in macOS, is GateKeeper (macOS Security) attempting to “verify” the file on first open? In some cases, the video file is large and it can take several minutes to verify before it opens in media players like QuickTime or VLC. This prevents you from watching your...

When running full-screen apps in macOS, do you notice the macOS menu bar still showing at the top of the screen? This cuts off part of the top screen of whatever application you are running making the experience frustrating. In the past, macOS would automatically switch applications to full-screen when they tried to run.   You...