Re: 3.5.1: The reason it stops working is that the vbspell template gets deleted after the upgrade, probably due to product id, as it was made before products. I'll check on that.
In the mean time, to get it back, all you need to do is re-create the vbspell template, either by running the install script (only the template step), or create a new vbspell template by pasting this:
HTML Code:
$stylevar[htmldoctype]
<html dir="$stylevar[textdirection]" lang="$stylevar[languagecode]">
<head>
<title>vB Spell $vboptions[bbtitle]</title>
$style[css]
<script>
var iFrameBody;
var spell_formname="$FormName";
var spell_fieldname="$FieldName";
</script>
<script src="vbspell.js"></script>
<script>
$js;
</script>
</head>
<body>
<form name="fm1" onSubmit="return false;">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<tr>
<td class="tcat" colspan="2">
<strong>vB Spell</strong>
</td>
</tr>
<tr>
<td class="alt1" colspan="2">
<iframe name="spellbox" id="spellbox" width="100%" height="270" scrolling="auto" src="vbspell_iframe.php"></iframe>
</td>
</tr>
<tr class="alt1">
<td valign="top" width="310">
<fieldset class="fieldset" style="margin:0px">
<legend>Change to:</legend>
<div style="padding:$stylevar[formspacer]px">
<div>
<input type="text" name="changeto" class="biginput">
</div>
</div>
</fieldset>
</td>
<td width="310">
<fieldset class="fieldset" style="margin:0px">
<legend>Suggestions:</legend>
<div style="padding:$stylevar[formspacer]px">
<div>
<select style="width:100%" name="suggestions" size="4" onClick="this.form.changeto.value = this.options[ this.selectedIndex ].text">
</select>
</div>
</div>
</fieldset>
</td>
</tr>
<tr>
<td colspan="2" class="alt2" noWrap="noWrap">
<input type="button" class="button" name="change" value="Change" onClick="replaceWord()">
<input type="button" class="button" name="changeall" value="Change All" onClick="replaceAll()">
<input type="button" class="button" name="ignore" value="Ignore" onClick="nextWord(false)">
<input type="button" class="button" name="ignoreall" value="Ignore All" onClick="nextWord(true)">
<input type="button" class="button" name="learn" value="Learn" onClick="learnWord()">
<input type="button" class="button" name="thesarus" value="Thesaurus" onClick="thesarusWord()">
<input type="button" class="button" name="lookup" value="Lookup" onClick="lookupWord()">
<input type="button" class="button" name="quit" value="Quit" onClick="exitWord()">
<input type="button" class="button" name="done" value="Done" onClick="doneWord()">
</td>
</tr>
</table>
</form>
</body>
</html>