Dialog Disappears on Device Rotation

[reverse-unina]

When I perform these sequences of events, the dialog on screen disappears:

Sequence 1: [No external storage]

1. Click on More...
2. Click on Settings

Sequence 2:

1. Click on Select a wiki
2. Click on Available Wikis
3. Click on an item in list
4. Click on Download
5. Orientation Change

Sequence 3:

1. Click on Select a wiki
2. Click on Available Wikis
3. Click on an item in list
4. Click on Download Wiki
5. Click on Stop Download
6. Orientation Change

Sequence 4:

1. Click on Select a wiki
2. Click on More...
3. Click on Update Available Wikis from Web
4. Orientation Change