Troubleshooting using Citrix receiver

Hello there,

I'm newly registered.
We're using Dimensions CM for quite a long time now.
Users are connected to Dimensions through a citrix emulation (citrix receiver).
We are currently upgrading the user's OS from Windows 7 to windows 10.
In the same time, we do change the citrix receiver version (Citrix receiver 4.12 to citrix workspace UC3).

The new installation is not working properly. We noticed troubleshoots when selecting objects.

It reacts as if the object was still selected (it does a drag/drop move). It's not possible to do a simple select on the object wanted. it's just (a bit) confusing  

Has anyone here (using Citrix) noticed something similar ?
Any idea about a way to go through that ?

Thx a lot.