Microsoft finally FORCED me to 'upgrade' to win 8.1 from win 8.0, I'd been resisting since the end of last year as every time I went through the process it failed to upgrade and offered no solutions to the problems and generally required a factory reset to get things back to normal.
Anyway yesterday despite my best efforts to avoid any change it offered no choice but to upgrade within 4 hours! it restarted itself and upgraded, mostly successful but has left me with some significant problems.
I had problems with Cura 14.07 straight away, ultra slow reactions in the active model window. I can't zoom, rotate the view or use the other buttons, If I do a rotate view nothing happens tab through to another application then back to cura and the move has happened. I've removed re-installed and tried other versions of Cura but still the same problem even with very small models or no model loaded.
I'm running on a lenovo laptop with Nvidia GEFORCE and intel onboard graphics, played around with options on those and disabled virus firewall.
This is obviously a microsoft problem but given the symptoms in cura I wonder if anyone has any suggestions.