Issue
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This is caused by the Macintosh Easy Open (MEO) control panel. This occurs on PowerBook 5300 and 190 series computers running their original system software version 7.5.2.
Workaround
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Disabling MEO in the Extension Manager control panel and restarting the computer prevents this issue from occurring.
Resolution
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Installing either the PowerBook 5300 Software Update or the System 7.5 Update 2.0 will correct this issue making the workaround unnecessary.
Article Change History:
13 Mar 1996 - Added resolution information.