Issue: Insert Image Editor Button Not Working

Since vBulletin 4.1.10, when attempting to use the WYSIWYG version of the "Insert Image" editor button (vBulletin's IMG/ATTACH BB-Code), after uploading the new image, nothing appears in the post. Clicking the "Manage Attachments" below the editor shows that the image is in fact attached, but it doesn't appear inline.

Further, if we change editor modes after the editor has initially loaded (WYSIWYG -> Standard, or Standard -> WYSIWYG), then the functionality of the Wiki Image button breaks - it no longer opens the Asset Manager, and instead inserts the incorrect WIKI_IMAGE tags into the editor.