Since may 26th the app often crashes (Shockwave Flash plugin does not respond) when dragging items. Frequently the mouse will stop moving near a border of an element which is not moved.
Im am using:
Does it happen only with Chrome? What about Firefox or IE?
@Paul: can you also post the project id? You can find it in the URL: http://gotiggr.com/project/XXXXX
I had same problem in Firefox as well. IE I haven't tried. Project-id is 13188.
Didn't try again last week due to holidays 
We saw some errors in the log and we think we fixed them in version that's going to be released next week (6/15). Try it then and let us know if you still experience these problems.