Visual Studio mouse over debugging doesn't work for particular variable
<p>I am trying to debug a controller and a particular variable does not show the tooltip. I tried restarting the computer and visual studio to no avail.</p>

<pre><code>    [HttpPut]
    [Route("{id}")]
    public async Threading.Task&lt;IHttpActionResult&gt; Put([FromUri] Guid id, [FromBody] Api.Document documentModel)
    {
        var test = await PutOrStatusCodeAsync(documentModel, id).ConfigureAwait(true);
        return test;
    }
</code></pre>

<p>ALL other variables can be moused over:</p>

<p><a href="https://i.stack.imgur.com/At7G6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/At7G6.png" alt="&lt;code&gt;enter image description here&lt;/code&gt;"></a></p>

<p>But not the one I need:</p>

<p><a href="https://i.stack.imgur.com/CDww9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CDww9.png" alt="enter image description here"></a></p>

<p>I added it to the watch list and am getting "Internal error in the expression evaluator". </p>

<p>I found this thread: <a href="https://stackoverflow.com/questions/21854426/get-internal-error-in-the-expression-evaluator-on-add-watch-function-when-tr">Get &quot;Internal error in the expression evaluator&quot; on &quot;Add watch&quot; function when trying to debug WCF service code (MSVS 2013)</a>, but my use Managed Compatibility Mode is greyed out!</p>

<p><a href="https://i.stack.imgur.com/2verB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2verB.png" alt="enter image description here"></a></p>

<p>I am running VS as an admin. HELP!</p>