DOpus 10: Grouping with the Alt key does not work

Hi, I just upgraded to the version 10. When Alt-clicking on a column header to group the files by this field then nothing happens! Is there any special setting to activate this? I've searched in the Settings dialog but did not find anything. Grouping with the context menu does work.

Alt-Click on the column header groups as expected here on a W7-64 system and an XP-32 system.

Regards, AB

Constants:
VK_CONTROL = DEC 17 (HEX 11)
VK_MENU = DEC 18 (HEX 12)

Very strange: The Grouping works with the "Alt Gr" key instead of the "Alt" key!!

I have a Cherry VarioKey keyboard (model number: G86-21050DE) with German layout. Using Charprobe (dextronet.com/charprobe) I get the following scan-codes:

"Alt key": VK_MENU

"Alt Gr" key: VK_CONTROL on KeyDown (when pressing the key) and VK_MENU on KeyUp (when releasing the key)!

My system: Windows 7 64bit Ultimate

On keyboards with German layout (I don't know if this is the same on keyboards with English layout) the modifier key combination "Ctrl+Alt" (German: "Strg-Alt") can be used instead of the "Alt Gr" key, so this also works with the Grouping feature.

An explanation (in German language) of the "Alt Gr" can be found here: secure.wikimedia.org/wikipedia/de/wiki/AltGr
(Google translation can be used for non German speaking people).

I just tried this grouping feature, and it is nice. However, I figure out how to ungroup the display. Can someone please tell me how?

To turn grouping off, you can use the context menu on the header or file display background (Group By -> None), or Shift+Alt+Click on the column header.