March 15, 2012, 10:51:58 am
Yes, you basically select category 1 (eg,
Transport), then press
CTRL + SHIFT + Left-click while dragging the mouse cursor to make a rectangular selection. Then select category 2 (eg,
Trees & Plants), press
CTRL + SHIFT + Left-click while dragging the mouse cursor to make a rectangular selection.
However, if you don't use the rectangular selection, but click on individual models while pressing
CTRL + SHIFT, it only works the second time you click on them for some reason...

Needless to say, this is a bug which I need to report on the bug tracker list - thanks for mentioning it.