DWMX corrupts file

I have a .cfm file with the following lines:
</td>
</cfloop>
</tr>
</cfloop>

When I open the file in DWMX it changes to:
</td>
</tr></cfloop>

</cfloop>

Obviously not the same! The above snippets were obtained by 1. Opening the file in NotePad and copying the lines, then 2. Opening the file in DWMX and copying them. I tested this several times to confirm it was actually changing them. Of course, I first discovered it the hard way, making a minor change to the file, then saving it only to find the output corrupted, then comparing it to the original to discover the unwanted changes. BTW, I have "never rewrite code" set for all file types.

I've reported this as a bug but if anyone has any thoughts I'd be interested in hearing.

Ken