Hi, When themename_preprocess_block() is called the content of the block is already rendered. I am looking for a way to modify the environment before the block is rendered and a way to restore the environment afterwards. The specific use case is that I have two blocks, generated by views, one showing the terms from one taxonomy and the other the titles of the nodes belonging to that taxonomy. When one navigates to a node the link to that node is active but I would like the link to the taxonomy to be active as well. An easy way to accomplish this would be to do a menu_set_active_item('taxonomy/term/tid') before the taxonomy block is rendered and reset it afterwards. Unfortunately this doesn't seem to be possible. The only other way I can think of is to modify the block content via regular expressions in themename_preprocess_block(). Thank you for your time, Olivier