I'm currently using Adagio (OE 8.1E, IC 8.1D, AR 9.0C, AL 9.0D & AP 8.1D) which is on Windows Server 2012 as the file server. I run (with administrative rights) the workstation install on my Windows 8 Pro and it went fine. I've been using it for two months now with no issue.
Since you're drives are mapped you cannot run the program as other user just like you mention. Because if you "run as" other user somehow the mapped drive can't be seen by the program.
Another thing, the user may need to be assigned an administrative rights on the local workstation. But after the installation and everything is running fine you can then re-assigned it as a power user.
Also the mapped drives in windows 8 disconnects automatically after certain minutes when idle. So I disabled the auto-disconnect which is really not good because I'm constantly connected to the file server.
To check the Auto Disconnect idle time limit:
Net Config Server
To disable the Auto Disconnect:
Net Config Server /AutoDisconnect:-1
Let me know if it works out.
Marlon