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Important Release Notes

Workarounds for specific issues

The screen display might not work correctly with macOS Sierra: If you are using the output channel “Screen Display” with one of the latest versions of the Macintosh operating system, sensor data may not be shown correctly. Instead, pixel noise appears in the display area. The exact circumstances will depend on the graphics chip that is currently in use, the exact version of macOS, and your personal preferences for the screen display feature.

Workaround: This is a known defect with specific graphics drivers that are shipped with macOS Sierra. It is currently unknown when and if Apple will fix this problem. As a workaround, reduce the width of the screen display, either by switching it to vertical mode, or by removing sensor entries from the list.


The menu of the menu-bar status display may not be complete in macOS Sierra, and the Lite version of the application cannot be quit with this menu. When the menu attached to the status item at the right side of the menu bar is opened, the latest versions of the Macintosh operating system may not show all entries. The lowermost items are missing. In case of the “Lite” version, this additionally means that the items to quit the application or to control remote operation cannot be selected.

Workaround: This is a known defect of macOS Sierra. It is currently unknown when and if Apple will fix this problem. As a workaround, reconfigure the output channel “menu bar” to show less sensors.


After updating from a previous version of the software, an ambient air sensor has the status “disconnected” on some iMacs: If you have updated to Hardware Monitor 5.1 or later from an older version of the application and you have used the program on an iMac published later than the “Late 2013” model series, the temperature sensor labeled Ambient Air will no longer be displayed. In your list of preference settings for this sensor, it is shown as being disconnected.

Workaround: This is the correct and intended behavior. Although the aforementioned iMac model series contain a sensor with that name and function, this sensor is known not to work as expected, so its readings should be suppressed. Hardware Monitor 5.1 and later will do so, but older versions of the application may have created display preferences for this sensor which have been stored in your settings. You can safely remove this entry from your sensor preferences.


Monitoring GPU sensors on computers which have two independent switchable graphics units is not officially supported by the application: Some specific Apple computers come with two alternative GPU solutions: One energy-saving graphics processor inside the main processor and one high-performance graphics processor on an external chip. Such computer models show the option Automatic graphics switching (or similar) in the pane Energy Saver of System Preferences. If the option is active, which is the recommended default setting, the computer may change GPUs during operation, switching one graphics processor off and the other graphics processor on. All sensors of the GPU currently powered down will also become inactive. Due to architectural problems, there can be unexpected side effects in the application when you monitor such sensors.

Workaround: We don’t recommend to monitor any of the GPU sensors for such computer models. Identify all graphics processor sensors in the pane Sensors of the Preferences panel of the application and set the check mark Data query: Don’t acquire readings from this sensor for each of them.


When running monitoring utilities of other vendors which also access S.M.A.R.T. features of hard drives, Hardware Monitor can be blocked from accessing S.M.A.R.T. readings: Certain low-quality monitoring applications of third-party vendors are known to reserve exclusive access to the S.M.A.R.T. interfaces of hard drives. When running such applications, neither Hardware Monitor, nor other applications, like Apple’s Disk Utility or System Information, can access any S.M.A.R.T. features until the misbehaving application is quit. S.M.A.R.T. sensors or probes show a value of “—”, the Drive Overview window shows “S.M.A.R.T. status: not available”.

Workaround: Either disable S.M.A.R.T. monitoring in the third-party application, or contact its vendor to have the problem resolved. It is bad practice to use exclusive access to the S.M.A.R.T. interfaces of hard drives.