If I have any tool chosen, for example the rectangle tool, and use that cursor to click either Undo or Redo, then return the cursor to the field (the rectangle symbol re-appears), then hit Spacebar to choose the Select tool, the Select tool is indeed chosen, but also the preceeding Undo or Redo command is repeated, and continues to repeat each time the Spacebar is hit.
Oddly, this does not happen if Select is chosen by hitting the Select arrow icon on the left of the screen. Nor does the above problem occur in Make 2017. For years I have habitually used Spacebar in SketchUp for Web to choose the Select tool, and have no memory of this problem occurring. But now, unless this problem can be corrected, I must stop using Spacebar as Select shortcut, as it might lead to an unintentional Undo or Redo.
Any suggestions will be appreciated. Thanks.