Under the System options click the 'Universal Access' icon and it will open a new window. Check 'Enable access for assistive devices' At the bottom of the Universal Access window you will see a check box labled Enable Access for Assistive Devices. Similar to the post on this page about Mac OS X 10.9 (Mavericks), to resolve this issue on Mac OS X 10.8 (and likely on earlier versions of OS X also), you need to ensure that the 'Enable access for assistive devices' option has been enabled in the Accessibility pane of System Preferences.
Just upgraded to Yosemite and it seems like the Jitouch extension is asking me to 'Enable access for assistive devices', it is opening the System preferences for me and it has already places System preferences on the list of apps that can use the assistive devices. Everything seems to look OK but after each reboot, I get the same alert message, and clicking OK takes me back to System preferences to 'Enable access for assistive devices'.
But where exactly is the 'Enable access for assistive devices' box to be ticked?
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When selected, the Universal Access preferences setting Enable Access for Assistive Devices in Mac OS X may conflict with the Adobe application. To deselect Enable Access for Assistive Devices:
The Adobe Captivate demonstration below illustrates change the Universal Access preferences settings. For more information about viewing this demo, see Viewing Adobe Captivate Demos in Knowledgebase Documents (TechNote kb403894).
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