Thanks. This did help.
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Started up the game, got the guy standing on a blank screen. Left mouse button brought up the canvas, but nothing happened as I moved the mouse, even when pressing keys. WASD did work outside of canvas mode, but again, blank screen. Moving the mouse wildly gave me glimpses of scenery at the edge of the screen, but the screen returned to blank afterward.
Tried "experimental" feature from the main menu. That got me scenery. LMB entered canvas mode, moving the mouse while holding Q had a destructive effect on some rocks, but the game completely locked up as I was on the verge of making a pillar explode. "Close Window" from the taskbar did nothing, had to use Task Manager to kill the process.