Everyone:
I am not aware of any of these problems post-SP1. If you have specific examples, please e-mail me directly with the files and explanations, at cgraye@vectorworks.net.
I will say this, however - when you are trying to "T-join" at an "L-join", the component joins of the L-join will be removed. This is by design. We are aware that joining components at these three-way intersections is a major wish, and we plan to address it in a future release. But for now, this is the expected behavior.