If you happen to click on the Variables tab of a BO while you are disconnected from a Connection you loose the variable listing. It can be resolved by closing the solution and re-opening but it is a bit frustrating.
Even more frustrating is that it also happens to Library BOs which should be read only.
Not sure how many of you work in this manner but I do find it useful to be able to work with a definition of the data source whilst not necessarily being in an environment where I need to be connected to that source. Maybe the resolution of BO variables could be disconnected from a click on the tab or maybe if the resolution fails the existing variable definition is not wiped out.
(v9.1.2.2)