Hi Micmac,
I resolved the problem disabling FTH:
To disable Fault Tolerant Heap entirely on a system, set the REG_DWORD value HKEY_LOCAL_MACHINE\Software\Microsoft\FTH\Enabled to 0.
After changing this value, restart the system. FTH will no longer activate for new applications.
I spoke with Ondra last weekend and he explained me that is not a Corona fault but it is related to some Windows Update.
You know Windows now installs some updates automatically and you can not manage them any more.
If you read the Corona Help Desk it seems the problem is related with long pre-rendering, long saving, freezing, etc.
In my case those problems don't occur so we can disable FTH.