BPMN, intermediate event set and modify as edge mounted

[Bebert]

Hi,
I used  intermediate event edge-mounted on activity, sub activity, pool very easily. I work with BPMN business process2.0
Since I've upgraded to EA 13.5 (I think it's related). I've some issues.
It's very difficult to drop on the edge of the activity element. In this case, I don't have the context menu when I release. the consequence, I've got an non edge-mounted.
Another Issue, when I work with sub activities, I click on the edge of my activity, I've got the context menu and I select the edge-mounted and nothing. No element 've been created on the diagram either in the project browser.
I can't created an intermedaite event on a pool, may be it"s not a good practice but it worked before.
Do I be alone with this this kind of behavior or do I something wrong ?
Can we change a free intermediate event to a mounted-edge one ?
Thank you