The test version has been updated to 0.98. In this version CRT modeling has had a number of bug fixes applied, which also made it to stable today as version 0.97.4. One of the major features implemented so far in 0.98 is a switch from canvas drawing to native SVG manipulation. The canvas drawing, while being very performant, proved to be too difficult to extend. As browsers have matured, SVG has almost caught up in performance, and with it adding new graphical primitives is much easier.
As a result of this, event handling had to be rewritten, so quite a lot has changed in the interface even if it looks deceptively alike the canvas version. Therefore we would appreciate if you report any anomalies you may find in 0.98. Some rarely used features had to go, like the drop shadow effect. Others have been refined, like the graphical debug of the force directed graph layout algorithm.
This is just the first of many new features in 0.98. Stay tuned!