Check if DragDropEventBase.isSupported() and if not, stop trying :D 
According to [1] is not supported by ie6 and ie8 and there is a 'maybe' for 
everything else.

I can't see where the problem could be, you are doing the right things:
- set the element draggable;
- add a dragstarthandler to the element and use setData(...) in it;
- add a dragoverhandler on the element target;
- add a drophandler on the element target, use preventDefault() and consume 
the data with getData() (you are not doing that tough, hence try it).
See [2] from slide 54.

Then I'd try to use the native handlers (e.g, addDropHandler() and so on, 
instead of addDomHandler()) if supported by the widget. Or change the 
target widget. Also, as suggested in the commit [3], try to select the text 
before start to drag.

Can't say anything else, at the moment.

[1] 
http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/src/com/google/gwt/event/dom/DragEvent.gwt.xml
[2] 
http://static.googleusercontent.com/external_content/untrusted_dlcp/www.google.com/it//events/io/2011/static/presofiles/gwt_html5_a_web_develops_dream.pdf
 

[3] http://gwt-code-reviews.appspot.com/1420811

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