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I ran into a problem on a multilingual site where we have 2 languages, and a separate menu for each languages, like we always set it up.
There are 3 pages using views to show a collection of items. The links of these pages are exactly the same for both languages, as is common with views.
This resulted in the breadcrumb titles being always FR or always NL, depending on which menu was the highest in the hierarchy settings (Enable / Disable Menus) of the menu_breadcrumb module.
I wrote a patch to take the current language into account when determining what menu item to set as active. Note that all of your menu items must have a language set using i18nmenu module. A new setting is added in the config of the module to take languages into account. The setting will only be active if you have the i18nmenu module active.
The patch works, but I don't like my solution. Alot more work would be needed to to a proper i18n integration here, in my humble opinion. Never the less, I would like to contribute it as it might be helpful to come up with a proper solution.