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Three things that I would try in this order are:

• click on another button in the same toolbar, and then click this button again. I have seen this behaviour from the Measure tool on that toolbar.
• close ArcMap (and perhaps reboot your machine) before restarting it
• locate and re-initialize your Normal.mxt file
• consider plugging in another screen to see if the toolbar has been moved off-screen

Things that I would try in this order are:

• click on another button in the same toolbar, and then click this button again. I have seen this behaviour from the Measure tool on that toolbar.
• close ArcMap (and perhaps reboot your machine) before restarting it
• locate and re-initialize your Normal.mxt file
• consider plugging in another screen to see if the toolbar has been moved off-screen
• uninstall, then reinstall, ArcGIS Desktop and bring it to the latest release at the same time, if possible

Three things that I would try in this order are:

• click on another button in the same toolbar, and then click this button again. I have seen this behaviour from the Measure tool on that toolbar.
• close ArcMap (and perhaps reboot your machine) before restarting it
• locate and re-initialize your Normal.mxt file
• consider plugging in another screen to see if the toolbar has been moved off-screen

Three things that I would try in this order are:

• click on another button in the same toolbar, and then click this button again. I have seen this behaviour from the Measure tool on that toolbar.
• close ArcMap (and perhaps reboot your machine) before restarting it
• locate and re-initialize your Normal.mxt file
• consider plugging in another screen to see if the toolbar has been moved off-screen

Three things that I would try in this order are:

• click on another button in the same toolbar, and then click this button again. I have seen this behaviour from the Measure tool on that toolbar.
• close ArcMap (and perhaps reboot your machine) before restarting it
• locate and re-initialize your Normal.mxt file

Three things that I would try in this order are:

• click on another button in the same toolbar, and then click this button again. I have seen this behaviour from the Measure tool on that toolbar.
• close ArcMap (and perhaps reboot your machine) before restarting it
• locate and re-initialize your Normal.mxt file
• consider plugging in another screen to see if the toolbar has been moved off-screen