Can't change watch format of QImage to "Displayed"

Open simple.pro, build with a Qt built with MinGW, set a breakpoint in line 272:

im.fill(QColor(200, 10, 30).rgba());

When breakpoint is hit, got to "Locals and Watchers" and "Change format for Type QImage" to "Displayed". A small window showing the (empty) QImage appears.
"Change format for Type QImage" back to "Normal". The small window disappears.
Now it seems impossible to change the format again, because the menu items are grayed. The enable them again, I have to restart Creator.

This worked fine in 2.0.0.