DRAG AND DROP IN ADD TABLE RELATIONS DONT WORK

Hi;
PHPRunner 5.2 Buil 4950 (page Datasource Tables)
When I try a "drag and drop in add table relations", it works fine the first time, after only works the manual way
The relations are with "views"
If I close the program and open again, then work fine one time more, but after only in the manual way
In the 5.1 it works fine!
I should do any thing different?
Thanks in advance
Aleix