PD-QVP under 8.1 Unicode version

If this proves to be a multiple post please accept my apologies - I keep submitting and getting logged off with a note stating that I don't have posting privileges.

At any rate, I'm posting about the PD-QVP viewer. I installed the DOpus unicode preview yesterday and have noted that the viewer is no longer recognised (latest build -, downloaded from this site and installed yesterday, followed by a reboot has failed to resolve this). Has anyone else experienced this and if so is there either a workaround or a fix in the offing?

Many thanks,