Thanks for all your efforts on this one but I for one would never strike this scenario because I do not use quiesce.
There are two quiesce options listed in ghettoVCB (along with warnings) but nowhere did you clarify which one was being utilised?
Because this is a free script provided from the goodness of someones heart the onus is on you to find a workaround.
Personally, when I require absolutely bullet-proof backups for mission critical vms, which I have had for several years thanks to ghetto, I shut the vm down before backup.
If you are unable to do so then you should be paying larger sums of money for your backup solution.
I have always viewed quiescing as a smoke and mirrors black art and studiously avoided it - hence no problems!