I followed the instructions to create a macro, create a Case with subject "Design issue with mechanical rotor", and ran the Macro. The feed shows the email along with the text "The Macros Team is working on your case" in the email Body. Yet I get this message when I check the Challenge:
"Challenge Not yet complete... here's what's wrong: 
The case with the subject 'Design issue with mechanical rotor' does not includes an email update in the case feed with the text 'The Macros Team is working on your case'. Make sure you run your macro on this case."

I even created a new Case with the correct Subject with the same results.

My Email Template has the following information:
Dear {!Contact.FirstName}, 

{!Case.Solution_Description} 

The Macros Team is working on your case 

Thank you, 

{!User.Name} 
{!Organization.Name} 

Your comment: 

{!Case.Description}

We try to "ant deployUnpackaged" with the Force.com migration tool for standard objects with custom fields, but it seems that some fields were part of the standard fields some releases ago but now they do not appear in a brand new organization. We are getting the following errors:

objects/Account.object (Account.CurrencyIsoCode) -- Error: Could not resolve standard field's name. (line 313, column 13)

The package.xml looks like:
<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>*</members>
        <name>CustomObject</name>
    </types>
    <version>34.0</version>
</Package>