On a lot of operations (adding a column, dropping a FK constraint), after the operation completes, the object browser collapses the tree.
I am running PgAdmin 1.16.1 The OS is Windows 7 The PG server is 8.4.13 (redhat). I have another machine running PgAdmin 1.14.0 Beta 2, WIndows XP, connecting to the same server. This version does *not* have the problem.