The Mixed Reality Forums here are no longer being used or maintained.
There are a few other places we would like to direct you to for support, both from Microsoft and from the community.
The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.
For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.
If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.
And always feel free to hit us up on Twitter @MxdRealityDev.
3D Viewer Beta update (Sep 22, 2016)
A new update to 3D Viewer Beta is now available in the Store. Here are the release notes:
September 22, 2016
1. Added support to open multiple models in the same session.
2. Improved shader support.
3. Updated controls to scale a model.
4. Model scale has been updated to 1 unit = 1 cm.
5. Bug fixes.
Known issues in build 1.1607.2705.0
1. The app might become unresponsive when opening too many models.
I'm a Microsoft employee and a member of the HoloLens team, however I do not always speak on behalf of Microsoft.