"Colons are not allowed in this name when namespaces are enabled"

FM11. DITA 1.2.

I am processing translated XML files that I recently received from the translator. Some of them open just fine, but when I save them, or reopen them after saving I get this message:

XML Parser Messages (Document Instance)

Error at file C:\foo.xml, line 22, char 77, Message: Colons are not allowed in this name when namespaces are enabled

Parse error at line 22, char 75: Not well-formed (invalid token)

Parsing aborted.

The problem is here:

<dita xmlns:ditaarch = "http://dita.oasis-open.org/architecture/2005/"><?Fm: BoolCondExpr"" State 0?>

See that colon in <?Fm: "BoolCondExpr"" State 0?> ? That's what's tripping me up. It's not in the file when I opened it originally, and the file opened just fine. I see this on save and then the file won't open.

Now I have to open the file in a text editor and get the colon out, before FM will open it again. This happens every time I open the file.

Where is this coming from???  It seems to happen only with the files I get from the translators. I've looked through read/write rules but I can't find it.

Any ideas? If I can't fix it, is there something I can just turn off to make this stop happening?