Simplify adds overlapping anchor points CS5

I've been using Object > Path > Simplify to clean up artwork but have found that it can create two overlapping anchor points. This adds an extra kink to the path as each anchor point has two control handles. This seems to happen regardless of the Curve Precision or Angle Threshold settings.
Anyone else getting this?
(Illustrator CS5 15.0.2, Mac OS 10.6.2)
Screenshots below:
1. Simple circle drawn with the ellipse tool.
2. Object > Path > Simplify... applied (Curve Precision 96%, Angle Threshold 0)
3. The two overlapping anchor points pulled apart for illustration

Unite is very helpful (thanks Steve) and sometimes cleans up the path completely. There are still times when Simplify adds a whole bunch of points to what seems to be a clean curve. Unite then helps to clean up the mess, but there are often extra points which create kinks or loops in the path. They are easy to miss as you have to zoom right in to spot them.
Also, thanks Wade for the suggestion about cutting the path and rejoining. It’s interesting that CS4 splits the path at the problem point shown above when using Simplify so you are left with an open path. It's as if CS5 rejoins the path but doesn't get the control handles right.
Thanks for the script link, Jesseham. I must look into using scripts more to simplify routine tasks.
I've combined Simplify with Unite into an Action to speed things up. But I’m still using Simplify with caution as often it does just the opposite.

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2) Restart the computer (you may do that up to 3 times);
3) Close down Illy and press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (easy but irreversible);
4) Move the folder Other options (follow the link with that name) with Illy closed (more tedious but also more thorough and reversible);
5) Look through and try out the relevant among the Other options (follow the link with that name, Item 7) is a list of usual suspects among other applications that may disturb and confuse Illy, Item 15) applies to CC, CS6, and maybe CS5);
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http://www.adobe.com/support/contact/cscleanertool.html

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It looks as if you have a lot of areas with the same color inside itself...
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Photo of a heart...
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Hey, Forum;
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& bending of the sheet). After setting a new keyframe and
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wozza,
Are you sure you are selecting the path, not the guid?
It may be time to look at the list.
The following is a general list of things you may try when the issue is not in a specific file (you may have tried/done some of them already); 1) and 2) are the easy ones for temporary strangenesses, and 3) and 4) are specifically aimed at possibly corrupt preferences); 5) is a list in itself, and 6) is the last resort.
1) Close down Illy and open again;
2) Restart the computer (you may do that up to 3 times);
3) Close down Illy and press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (easy but irreversible);
4) Move the folder (follow the link with that name) with Illy closed (more tedious but also more thorough and reversible);
5) Look through and try out the relevant among the Other options (follow the link with that name, Item 7) is a list of usual suspects among other applications that may disturb and confuse Illy, Item 15) applies to CC, CS6, and maybe CS5);
Even more seriously, you may:
6) Uninstall, run the Cleaner Tool (if you have CS3/CS4/CS5/CS6/CC), and reinstall.
http://www.adobe.com/support/contact/cscleanertool.html

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Simplify adds overlapping anchor points CS5

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