The development release is the hairy edge. Though it may get fixes before they show up in the commericial aligned release, it also can contain errors and "experimental" code. I've been playing with parallel_invoke, for example, working on some test cases for a blog I'm writing. I've already hacked the header file to overcome a compilation issue. So you may be able to find fixes like the one you think you've found, but always remember the development release is the least stable of the TBB variants to be found on the web site.