First of all: Thanks for sharing “Loco Translate” here in wordpress repository. I’ve been looking for an alternative to the good old WP-plugin “Codestyling Localization”, which I used before, and your plugin seems to be a real good choice. Very cool plugin!
Playing around with Loco Translate in a local install of WP, the same error happened with the plugin Ultimate Member:
We are using the plugin Ultimate Member (the free version here in the repository)and getting the same Error: Invalide MO format.
The language settings of Ultimate Member (via Dashbord in the Plugins Menu) can be “forced” to update the language file acc. to the settings of WP (in our case German), and this seems to work as there are files named ultimatemember-de_DE.po and ultimatemember-de_DE.mo in wp-content -> languages -> plugins. Looking for the translations of Ultimate Member via Loco Translate, I cannot find that German .mo or .po file, but a Template-file redux-framework.pot and redux-framework.mo, which seems to be invalid: Trying to add a “New language” turns the message “Error: Invalid MO format”.
Does Loco Translate ignore files in the languages-folder of wp-content or are the settings of Ultimate Member preventing Loco Translate?
Cheers, Heike