Dialog Checkbox graphics glitch in 12.21

There is a weird graphical bug with dialog checkboxes in 12.21. Display the dialog. Sometimes it opens right away with random colors, if not try again. Run your mouse up and down the list, the colors will become psychedelic.

I rolled back to 12.12.2 (Beta) x64 and the bug is not there. I also tried 12.20 XP and the bug is not there. Seems isolated to 12.21

12.20 Fine:

12.21 Not Fine:

<?xml version="1.0"?>
<button backcol="none" display="label" label_pos="right" textcol="none">
	<label>TROUBLESHOOT</label>
	<icon1>#newcommand</icon1>
	<function type="script">
		<instruction>@script VBScript</instruction>
		<instruction>Set Dlg = DOpus.Dlg</instruction>
		<instruction>Function OnClick(ByRef clickData)</instruction>
		<instruction />
		<instruction>    Dlg.window = clickData.func.sourcetab</instruction>
		<instruction>    Dlg.template = &quot;maindlg&quot;</instruction>
		<instruction>    Dlg.detach = True</instruction>
		<instruction>    Dlg.Show</instruction>
		<instruction />
		<instruction>    &apos; message loop</instruction>
		<instruction>    Do</instruction>
		<instruction>        Set Msg = Dlg.GetMsg()</instruction>
		<instruction />
		<instruction>    Loop While Msg</instruction>
		<instruction />
		<instruction>End Function</instruction>
		<instruction>==SCRIPT RESOURCES</instruction>
		<instruction>&lt;resources&gt;</instruction>
		<instruction>	&lt;resource name=&quot;maindlg&quot; type=&quot;dialog&quot;&gt;</instruction>
		<instruction>		&lt;dialog height=&quot;402&quot; lang=&quot;english&quot; title=&quot;TITLE&quot; width=&quot;930&quot;&gt;</instruction>
		<instruction>			&lt;control checkboxes=&quot;yes&quot; fullrow=&quot;yes&quot; height=&quot;378&quot; type=&quot;listview&quot; viewmode=&quot;list&quot; width=&quot;816&quot; x=&quot;12&quot; y=&quot;6&quot;&gt;</instruction>
		<instruction>				&lt;contents&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>					&lt;item text=&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&quot; /&gt;</instruction>
		<instruction>				&lt;/contents&gt;</instruction>
		<instruction>			&lt;/control&gt;</instruction>
		<instruction>		&lt;/dialog&gt;</instruction>
		<instruction>	&lt;/resource&gt;</instruction>
		<instruction>&lt;/resources&gt;</instruction>
	</function>
</button>

Thanks for reporting this, it will be fixed in the next update.

Thanks I'll keep an eye out.