When viewing the DICOM headers in the prearchive, you have to click the X on the upper right to close the dialog. This should catch the Esc key as well and close in response to that.
1. Upload a file into the prearchive.
2. Go to the prearchive viewer.
3. Select DICOM Headers->5 days.
4. Hit Esc. Nothing happens.
5. Click the [X] in the upper right. The dialog closes.