The 'back' button in 'Export workspaces' panel needs to be clicked twice to get back

Description of problem:
See summary and attached video of steps to reproduce.

Version-Release number of selected component (if applicable):
BPMS 6.0.0 ER3

How reproducible:
Always. This issue manifests itself both in Firefox 17 and in latest Google chrome 29.

Steps to Reproduce:
1. Go to workspace Showcase, page Import and Export
2. Bring panel 'Export workspaces' forward, click Export button
3. Download the workspace export file (using Download link)
4. Click the back button

Actual results:
The panel doesn't return back to menu with workspace checkboxes, but remains in the state with the Download link. The back button has to be clicked once more to really return back.

Expected results:
Just one click on the Back button should take you back to panels original state.