1. Enter a patient chart and select an exiting encounter.
2. On the left menu go to Administration -> Globals
3. Under "Appearance" check an item (I used "Use Charges Panel") and click Save.
4. Enter patient chart from step 1. I did this by choosing "Name" in the patient search on the left and selecting the patient from the list.
After doing the above steps you will notice that the "Encounter History" drop down does not work properly. If you select an encounter in the drop down list nothing happens. Also if you try to click on the "Selected Encounter:" hyperlink under the "Encounter History" drop down nothing happens. Last, if you try to click on "Visit History" in the "Visits" left menu nothing happens. Logging out and logging back in seems to take care of the problem (not sure if that is what is supposed to happen when you save globals).
I tested this on the following systems and browsers:
OSX 10.8.1 (Mountain Lion)