Starting from release 2.6-alpha b351 or later any files created/saved prior to 2.6-alpha b296 will have colour keys turned off by default. If you have since saved a file in a version after 2.6-alpha b296 this does not apply, and you will have to manually turn-off colour keys and then re-save the file.
I've tried to add colour keys in a bar view via Tools > Toolbars and styles > Colour keys. Unfortunately they are not displayed. Is it a bug or a feature? (Version 2.6 64 bit, build 512)
Does it work for two bar views on a tab with two different stacks? I have a tab with two bar views, first one stacked by company, second one stacked by country. If I use the drop-down in the main toolbar I can only choose one of them. The (bar) view toolbars don't give me "colour" option.