I have WPML plugin installed which displays the language menu in the header. It's fine on all the pages except for /catalog/products page. All the other Marketpress pages are fine.
I'm posting this from the DEV plugin which doesn't allow me to post images. I'll post images on the site next.
Marketpress: Version 2.9.6
WPML Multilingual CMS: Version 188.8.131.52
WPML String Translation: Version 2.0.14
WPML Translation Analytics: Version 1.0.6
WPML Translation Management: Version 1.9.9
WPML doesn't support your MarketPress plugin anymore and suggest I use WooCommerce instead.
Thanks for looking into this.