Hello,
This issue may be related to unescaped characters in XML exports, such as &. Thus, you can check for unescaped characters (might be easy with an editor providing syntax highlighting). Replacing the character by its XML escaped form or surrounding the value by a CDATA section should do the trick.
If you don’t find such characters, you can send me your export at this address: nnoullet_at_kagilum_dot_com.