Still having these exact issues. Even with 10.6 the bug did not disappear, opening proberties or trying to change the scale bar settings taking several seconds. My workaround 2 months ago was basically to go back to ArcMap 9.3.1 - not kidding. I hear from colleagues on entirely new machines, the issue is gone. But I will wait until next year. Switching to Pro was not a solution even with a highend machine because its not running reliable.
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