Been seeing this for a while, have reported it a few time, but haven't seen any comment on it. I think this bug has been around since I started playing (March 2006). Please fix this, since it has persisted for so long, it has become my number one annoyance with the UI.
Issue:
The 'lock toolbars' under the UI options menu doesn't work as I'd expect it should.
Details:
When enabled, toolbars should be totally locked, meaning that all the items in the toolbar are locked into their spots, and the toolbar is locked to a fixed screen location.
There are a couple different ways that this seems to be a bug.
1) Toolbars can be moved when the option is enabled. One edge of the toolbar remains selectable to drag the tool bar around. On horizontal bars this is the bottom edge. On vertical bars this in the right edge (I believe).
2) Items in the toolbars can be moved once. If the item has been moved (mouse dragged) it becomes locked after it has been released. This is at the items origin and destination locations. These now locked locations seem to persist across multiple log-outs and log-ins and changing characters. Reloading the client resets these locked locations to unlocked.
Wishful thinking:
Lock the entirety of the UI, so that nothing can be moved around.