I'm not sure if this is a bug from previous version changes or intended as new search logic, but I see the same problem in ubbcentral.com forums, currently at 7.4.1.
Example: As you read this post, click on the Search pull-down, then click Advanced. Does it automatically select "Version 7 Installation Assistance"?
My Perspective: Testing as I write this post(current URL:https://www.ubbcentral.com/forums/ubbthreads.php/ubb/newpost/Board/10.html), it does default to the correct selection. However, when I am reading posts in any of the ubbcentral forums, the advanced link defaults to "All Forums" in the advanced search form.
Looking at scripts/search.inc.php, I'm guessing it has something to do with the preg_match using #Board without consideration for #forums after recent changes to URL structure?
I posted here before reporting as a bug. What am I missing?