Fatal error on part creation while uploading another part

I am using Creo Parametric Release 7.0 and Datecode7.0.8.0

Hello,

I experienced something weird with Creo 7.0.8.0 and Windchill 12.0.2.1 :

When I save and upload a CAD, if I am quick enough to create a new part while the upload is running, Creo crashes with a fatal error.
This problem is easily reproducible (only need to be fast).

Any idea what is the cause of this issue? Is there any way to tell Creo and/or Windchill not to start a download (in this case, the startpart) while another server operation is running (in this cas uploading a CAD)

Thank you in advance