RoboHelp 8 crashes when clicking See Also tab of Design-Time Control Properties

My project was previously in RoboHelp 7 and is a merged project. I copied a topic with see also buttons and want to edit the links. I right click the button and select Design-Time Control [name] Properties and click the See Also tab. RoboHelp crashes every single time. Error message:

One thing that is a little strange is that some of the buttons have Design-Time Control [object1] Properites and some have Design-Time Control [RelatedTopic] Properties, but all have the See Also tab.

If I insert a new See Also button using Insert > See Also, the menu choice is Design-Time Control [See Also] Properties and the tab is See Also. Click the tab and RoboHelp crashes.

If I insert a new Related Topics button using Insert > Related Topics, the menu choice is Design-Time Control [Related Topic] Properties and the tab is called Related Topics. Click the tab and RoboHelp does not crash.

I have a whole lot of these buttons I need to modify, so I'd appreciate if anyone knows of a solution to this problem.

Sample HTML for an offending button:

<!--Metadata type="DesignerControl" startspan

<object classid="clsid:A2F1FA63-C1E6-11d2-9140-006DC83B9955" border="0"

         id="object1" style="margin-top: 0px; margin-bottom: 0px; margin-left: 0px;

         margin-right: 0px;" align="bottom">

<param name="_Version" value="65536"  />

<param name="_ExtentX" value="1720"  />

<param name="_ExtentY" value="582"  />

<param name="_StockProps" value="13"  />

<param name="ForeColor" value="0"  />

<param name="BackColor" value="12632256"  />

<param name="UseButton" value="-1"  />

<param name="UseText" value="0"  />

<param name="ControlLabel" value="See Also"  />

<param name="UseIcon" value="0"  />

<param name="Items" value="ChgSubErrSeverity - see also$$**$$"  />

<param name="Image" value=""  />

<param name="FontInfo" value="Verdana,8,0,,BOLD"  />

<param name="_CURRENTFILEPATH" value="C:\DocsClassic\CARS-Maintenance\HelpSourceZip313\carsis\Changing_Submission_Error_Severity.htm"

  />

<param name="_ID" value="object1"  />

<param name="DialogDisplay" value="1"  />

<param name="Frame" value=""  />

<param name="Window" value=""  />

<param name="ChmFile" value=""  />

<param name="DisableJump" value="0"  />

</object>-->

<object

  classid="clsid:ADB880A6-D8FF-11CF-9377-00AA003B7A11"

    type="application/x-oleobject">

  <param  name="Command"  value="ALink,MENU" />

  <param  name="Button"  value="Text:See Also" />

  <param  name="Font"  value="Verdana,8,0,,BOLD" />

  <param  name="Frame"  value="" />

  <param  name="Item1"  value="" />

  <param  name="Item2"  value="ChgSubErrSeverity - see also" />

</object>

<!--Metadata type="DesignerControl" endspan-->