There was an upgrade of windows 8.1 pro 64. And now opus will not start at all, I reinstalled it, with no effect, i went into the file manager to click the exe file with no result, it is completly unresponsive
Is dopus.exe (not dopusrt.exe) appearing in Task Manager's Processes tab when you launch Opus?
Have you tried launching via the Start Menu or other methods?
Does anything appear on the taskbar form Opus when it launches?
Which version of Opus are you using? If Opus was also updated recently, the problem could be antivirus blocking a newer exe it has not seen before.
Problem solved, for some reason the connections with the NAS server (synology) mapped drive could not be establised, aftere restarting the NAS and the pc it works, it looks like the fact that it could not connect to 6 mapped drives made it unable to start at all (at least that is my theory)
Micha