Resolved
Reported for: WPML Multilingual CMS 4.5.10
Resolved in: 4.6.0
Overview of the issue
If you are importing XLIFF files in the Import / Export XLIFF section available in WPML > Translations, it will display a second browser window just after selecting your XLIFF file.
Workaround
Our developers are aware of this situation and they are working on it.