I just upgraded to 9.1.124 and can't get my viewports setup. I am wanting to use a refrence image on one of the viewports. It used to be that holding space and pressing x would active the viewport the mouse was over. Now it seems to affect the selection magnet. What do I use to select a viewport now? I can't find anything in Help about it.

In order to free up x for grid snapping (with c for primitive snapping and v for point snapping) the grid focus hotkey needed to be changed. Similarly the spacebar-t for expanding and minimizing viewports had to change to allow for the t key to always go to the Move/Translate tool.

The new focus hotkey is n or spacebar-n and can also be found at the bottom of the viewport menu.

The new expand/minimize button for the viewport is b or spacebar-b.

Great info! Thanks so much!

Some of these new hotkeys are listed on this quick reference card:

http://www.sidefx.com/images/stories/blogs/houdini9_blog/h9_quick_ref_card.pdf [sidefx.com]