Modified catalogue parts not saved when using 'Save All'

Details: <p><strong>Testing:</strong></p><p style="margin-left: 40px;">- Click &#39;Catalogue tools/Browse class catalogue content&#39;, and choose any class that has parts defined.</p><p style="margin-left: 40px;">- Choose a part (make sure you&#39;ll remember which it is later...) and go to &#39;Home/Hide from catalogue&#39;</p><p style="margin-left: 40px;">- Click &#39;Home/Save All&#39;</p><p style="margin-left: 40px;">- Close and reopen SkyCAD, and browse the same class catalogue again.</p><p style="margin-left: 40px;">- If the part is still hidden, we&#39;re good!&nbsp; If it shows again, it&#39;s bad!</p><p>&nbsp;</p>