After setting the layout in my mplay render viewer to multiple viewports (rows>1 and/or columns>1), it seems to get “stuck” that way, and can't be forced back into single viewport mode.

Neither hitting “b” or “T”, clicking the Maximize Viewport button, setting the layout back to 1x1, or turning on/off Hide Blank Viewports seems to have any effect. The viewer stays in the highest viewport-number mode that it was previously set to (so switching from 4x4 back down to 2x2 doesn't work, either).

Any ideas?

Windows 7, NVidia GFX 470, Houdini 11.