Hi Andrew,
I have found the error! It is not explained on CIW (only the message I wrote previously is shown on CIW), but in the pvsUI_ipvs.log file, created in the directory on which I run virtuoso.
The error was caused by a missing library (GLIB_2.4) in the server I was using for my simulations.
I'm wondering why the same message is not shown on CIW or why is not shown a message telling the user to open this file.
Thank you
Best Regards,
Aldo