What??? The only problem I have seen reported with G3X V12.30 was a self inflicted problem of someone trying to operate their system without first verifying that all devices had completed their software updates.
After loading new software on the PFD, you should always immediately enter configuration mode after the display resets and stay in configuration mode watching the System Information page until all devices are showing the correct software versions provided in the software update.
On a multi-display system, I always load new software to all displays except PFD1 first, then load PFD1 and enter configuration mode as described above. It is only the PFD1 display that updates the software in the other system devices. If you have the capability, power off the additional displays (except PFD1) while PFD1 is updating the rest of the system.
Steve