Hi simco and David.jansson,
I'm sorry to hear that you both are having issues with the plugin. As a first step in looking into this, I placed the Translator on my client's website to test it in a secured (https://) environment. It seems to function properly here (see this screenshot):
As you can see I'm using the flag images and branding with no issues. This is also a WooCommerce shopping cart website, and it's being displayed on a WooCommerce template file.
Of course, this has nothing to do with either of your specific websites, so I'm guessing there is a more specific issue happening here in regards to your individual websites...there is something conflicting with the plugin obviously, I just don't know what that is yet.
Would either of you mind sharing your web address please?
Then I will look at the source code and see if I have any immediate suggestions. If you would like me to help personally to look into the issues, I would be glad to help.
You can contact me here: http://www.studio88design.com/get-in-touch/
If you don't feel comfortable with that, I will do my best to help you with the info you are willing to provide.
Thanks! I look forward to helping you!