Somehow I could not select a query column in the GUI interface. Although
I selected the correct map and layer, I could not select any columns.
Using the command line worked perfectly!
Nothing very important to worry about, but I just wanted to mention it!
The page (and others) were temporarily gone due to a wrong commit
which no longer allowed to compile scripts.
Fixed in SVN a few days ago (so, the issue happened for 1-2 days only).
2) Somehow I could not select a query column in the GUI interface. Although
I selected the correct map and layer, I could not select any columns.
Using the command line worked perfectly!
If still valid (could you also try grass70?), please open a ticket for it.