Unity Editor Hanging with 0% CPU Consumption

Ideas to help debug the problem, but I don't yet know with any certainty what it is.

Hanging with 0% CPU consumption may imply RA$$anonymous$$ overload. How much available RA$$anonymous$$ is shown? What version of Windows? Windows 7 Task manager only shows RA$$anonymous$$ and CPU consumption, so you'd need to hit the "Performance monitor" button (lower left area) so you can monitor disk performance metrics. In Windows 8.1 and Windows 10, these are on the performance tab of the task manager, where you can see how busy the disks are.

What I'm looking for is a measure of disk performance usage (if the disk is very busy, this is called 'thrashing', and may be that RA$$anonymous$$ is overloaded and the operating system is trying to use virtual memory to keep things running). If RA$$anonymous$$ is exhausted, it is merely that you don't have sufficient RA$$anonymous$$ for the version of Unity you've loaded.

If that's not it, we'll have to look elsewhere.

There is one other means this can happen. In Windows, all executable files are mapped as virtual memory. This means there is a V$$anonymous$$ subsystem active for all executable file reads during the use of an application, especially upon startup. If there's a flaw on the drive, this can cause the OS to hang, retrying to read a corrupt block on the drive (where the software resides), and that will lock the application for a while during this event, until it finally clears (gets the data), and then suddenly things start working again. If that's the problem, I'll need to know if this is traditional hard drive or SSD, but you may need a chkdsk /r (Google explains) to recover bad blocks on the drive.

Stepping through Unity's process, every time the hang happens, the following exception is thrown: Exception thrown at 0x0000000058879B95 in Unity.exe: 0xC0000005: Access violation reading location 0x000000000000005C.