I have the latest medium installed on my alienware and have been using it fine with my VIVE. Of course windows did a bunch of updating last week and since then Medium is not working, which is a big problem as my project is totally in medium. Help!
Post your crash log: C:\Users\<username>\AppData\LocalLow\Oculus\Medium\log
Make sure you're not running any GPU tuner software, such as MSI Afterburner. Temporarily disable any 3rd party antivirus software as well, just to eliminate the possibility.
Another thing that can cause a crash at startup is a corrupt asset file. You can debug that one by renaming your C:\Users\<username>\Documents\Medium folder to "Medium_Old" or something similar. Medium should start up in default mode and recreate the Medium folder. If it works, then you can start moving your sculpts, pictures, and videos back into the new Medium folder to determine which asset is corrupt.
Do you have multiple GPUs (either SLI/Crossfire or integrated graphics)? If so, please be sure all monitors and Rift are connected to the primary dedicated GPU. Nothing can be connected to secondary cards.