Ive been searching most everywhere for a solution to this and created an incident for it which lead nowhere other than some level 1 tech saying it was basically all windows rpc service fault (which was probably in her manuscript, but still completely unhelpful).
Anyway, my problem was this when using application aware backups after we upgraded from v7 to v8:
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12/2/2014 5:37:27 PM :: VSSControl: FinishSnapshot failed
Failed to execute VIX command: [RPC function call failed. Function name: [BlobCall].
RPC error:The stub received bad data.
When application aware backup was turned off, these machines got backed up just fine.
The usual suspects, restarting vmware tools, checking whether logins where actually assigned after the upgrade, double/triple checking logins, making sure vmware tools where all up to date, rebooting VMs etc etc.. all of them made absolutely no difference.
What did in the end work was deleting the VeeamVssSupport service (sc delete VeeamVssSupport from a prompt with priviledges).
After that everything worked as expected (i didn't need to reboot the VMs after this change).
We had this happen on 5 or 6 machines post the upgrade, some exchange, some mssql and one AD server, so there doesn't appear to be a clear pattern.
So heres to hoping this gets picked up by a google bot so you don't have to waste your time finding a solution.