Hi all, thanks to some great feedback from the community I can now confirm that there is a potential bug that prevents you from gripping the clipboard with Vive controllers. I'm also pleased to say it's not my game causing the bug, its a SteamVR issue!
There are two possible fixes for this issue...
Option 1 - Delete SteamVR drivers
1. Unplug your vive hub.
2. Open steam VR and select "Settings"
3. Then select "Developer" and scroll down to "Remove all SteamVR USB Devices"
4. Once it's finished, restart your computer.
5. Plug your Vive hub back in and it should reinstall the drivers, and hopefully fix the problem!
Option 2 - Change to/from SteamVR Beta
Some people have reported that the driver bug can be fixed by changing to or from the Beta version of SteamVR