kb40: Sliders used to set numeric values in the Web UI not initialized

In rare cases the sliders used to set numeric values in the Web UI may not finish loading within the allowed timeout period. This is a timing issue that may affect some client browsers.

If the sliders are not fully initialized the pointers for the sliders will be all the way to the left and the line that normally runs down the center of the slider will not appear. Clicking on the slider will finish initializing it and make it operational.