ZBrushCentral

Display BPR RenderPass hotkey?

The most frustrating thing about ZBrush rendering system is how the RenderPass disappears.

Examples:

I start a BPR, switch to a different app (a web browser for example).
Click back on ZBrush (or use cmd-tab), RenderPass shows for an instant, and it disappears.

Now, with 4R5 it’s gotten even worse with the Quicksave feature… now, even if I’m looking at the RenderPass in ZBrush, and a Quicksave happens, my RenderPass disappears.

Sometimes, even just moving the mouse will cause the RenderPass to disappear.

I’ve found that the easiest (only?) way to redisplay the RenderPass is to change/toggle something in the “BPR Filters” subpalette. This effectively brings the RenderPass back.

Is there a way to assign a hotkey to do this?
Or am I missing something really basic?

Mac OSX 10.6.8
ZBrush 4R5