tool participation rendering is incorrect on date change

[jshslsky]

If I change the date range and re-plot, the tool participation plot appears not to plot the data. I have upload timestamps like the following and I only see one data point when the date range is 4/11/12 - 4/12/12. This is data from the first PTSD Explorer user.

 2012-04-11 08:49:12        
 2012-04-11 08:49:12        
 2012-04-11 08:50:14        
 2012-04-11 08:50:14        
 2012-04-11 08:50:15        
 2012-04-11 08:50:15        
 2012-04-11 08:50:20        
 2012-04-11 08:50:20        
 2012-04-11 08:50:23        
 2012-04-11 08:50:23        
 2012-04-11 08:50:24        
 2012-04-11 08:50:24        
 2012-04-11 08:50:27        
 2012-04-11 08:50:27        
 2012-04-11 09:07:42        
 2012-04-11 09:07:42        
 2012-04-11 09:08:31        
 2012-04-11 09:08:31        
 2012-04-11 09:08:44        
 2012-04-11 09:09:18        
 2012-04-11 09:09:21        
 2012-04-11 09:09:21        
 2012-04-11 09:10:14        
 2012-04-11 09:10:14        
 2012-04-11 09:10:18        
 2012-04-11 09:10:18        
 2012-04-11 09:10:20        
 2012-04-11 09:10:23        
 2012-04-11 10:38:42        
 2012-04-11 10:38:42        
 2012-04-11 10:39:49        
 2012-04-11 10:39:49        
 2012-04-11 10:39:51        
 2012-04-11 10:39:51        
 2012-04-11 10:39:53        
 2012-04-11 10:39:53        
 2012-04-11 10:39:55        
 2012-04-11 10:40:00        
 2012-04-11 10:40:01        
 2012-04-11 10:40:06        
 2012-04-11 10:40:06        
 2012-04-11 10:40:16        
 2012-04-11 10:40:17        
 2012-04-11 10:40:23        
 2012-04-11 10:40:23        
 2012-04-11 10:40:29        
 2012-04-11 10:40:31        
 2012-04-11 10:40:36        
 2012-04-11 10:40:37        
 2012-04-11 10:40:42        
 2012-04-11 10:40:43        
 2012-04-11 10:40:51        
 2012-04-11 10:40:52        
 2012-04-11 10:40:52        
 2012-04-11 10:40:53        
 2012-04-11 10:40:53        
 2012-04-11 10:40:58        
 2012-04-11 10:40:59        
 2012-04-11 10:40:59        
 2012-04-11 10:41:00        
 2012-04-11 10:41:05        
 2012-04-11 10:41:05        
 2012-04-11 10:41:06        
 2012-04-11 10:41:06        
 2012-04-11 10:41:13        
 2012-04-11 10:41:14        
 2012-04-11 10:41:14        
 2012-04-11 10:41:19        
 2012-04-11 10:41:20        
 2012-04-11 10:41:23        
 2012-04-11 10:41:23        
 2012-04-11 10:41:27        
 2012-04-11 10:41:28        
 2012-04-11 10:41:28        
 2012-04-11 10:41:29        
 2012-04-11 10:41:32        
 2012-04-11 10:41:32        
 2012-04-11 10:41:37        
 2012-04-11 10:41:37        
 2012-04-11 10:41:41        
 2012-04-11 10:41:41        
 2012-04-11 10:41:42        
 2012-04-11 10:41:49        
 2012-04-11 10:41:54        
 2012-04-11 10:41:57        
 2012-04-11 10:42:00        
 2012-04-11 10:42:03        
 2012-04-11 10:42:07        
 2012-04-11 10:42:10        
 2012-04-11 10:42:14        
 2012-04-11 10:42:19        
 2012-04-11 10:42:26        
 2012-04-11 10:42:29        
 2012-04-11 10:42:31        
 2012-04-11 10:42:34        
 2012-04-11 10:42:38        
 2012-04-11 10:42:52        
 2012-04-11 10:43:01        
 2012-04-11 10:43:07        
 2012-04-11 10:43:11        
 2012-04-11 10:43:23        
 2012-04-11 10:43:28        
 2012-04-11 10:43:35        
 2012-04-11 10:43:37        
 2012-04-11 10:43:40        
 2012-04-11 10:43:43        
 2012-04-11 10:43:43        
 2012-04-11 10:43:43        
 2012-04-11 10:43:43        
 2012-04-11 10:43:46        
 2012-04-11 10:43:46        
 2012-04-11 10:43:47        
 2012-04-11 10:43:48        
 2012-04-11 10:43:52        
 2012-04-11 10:43:52        
 2012-04-11 17:05:39        
 2012-04-11 17:05:39        
 2012-04-11 17:05:40        
 2012-04-11 17:05:40        
 2012-04-11 17:05:42        
 2012-04-11 17:05:42        
 2012-04-11 17:05:44        
 2012-04-11 17:05:44        
 2012-04-11 17:05:47        
 2012-04-11 17:05:47        
 2012-04-11 17:05:47

[marc-schwartz]

Scheduled for deployment on 5/4/2012