Widget height

I’m trying to use the supplied widget for this plugin, but the parameters for controlling widget height/width do not work. I can see in the source that they have minimum values set, but even if I put in values above these, they are not saved and have no effect on the display of the widget.

I note that the plugin has not been updated for 8 months, so for a vendor supplied plugin, it’s not great that it’s not been updated more recently, or apparently tested with the latest version of WordPress.