You sure your using 3.x ? if so, what version exactly?Works nicely, but I'm getting an error message (just added plugins: [Ext.ux.grid.DataDrop] in the grid config)
Uncaught TypeError: Cannot read property '0' of null at ext-base-debug.js:3482
The data does appear in the grid, but the data isn't sent to the server (added newRec.markDirty(); in function dataDropped() before adding to the store. The dirty marks do appear as well, but data is still not sent (getting data to be sent using getModifiedRecords) =/
If you have an example page with this problem, that would help.
ExtJS Extensions & Plugins: GMapPanel UX | HtmlEditor Buttons Plugin | Selection Enabler Plugin | Grid DataDrop Plugin | Additional Ext.Fx
Sencha Touch Plugins: Swipe Tabs | List Pull Refresh | Accelerometer Tabs