Seems OmniFocus remembers the Sidebar selection in both context and project mode perspectives. It would be better if this were a per-perspective option. For example, in the default project perspective, I’d like it to show all projects every time I select it.
New smallish bug in the latest build: a context-mode perspective focusing on a context A that has sub-contexts A1, A2, and A3 and grouped by context will show a partition for A even if nothing is in it.