We have just released a minor version of Cytoscape Web, which fixes a
bug related to the new click-and-hold to pan feature.
This feature allows the user to pan the canvas without having to enter
an explicit pan mode. Instead, the user simply clicks and holds on
the background of the canvas to grab hold of it. He can then pan the
canvas by dragging the mouse. Lifting the mouse button ends panning.
We think that this new feature will improve the usability, by
providing a faster option for users to drag the network. However, it
is still experimental, and if you don't like it, please let us know.
If you prefer, you can just disable the feature completely by setting
-1 to the "mouseDownToDragDelay" initialization parameter (see
http://cytoscapeweb.cytoscape.org/documentation#section/org.cytoscapeweb.Visualization).
Thanks for your support!