Thank you for your post.
I have been unable to install FileMaker Pro 15.0.1 on my Windows Server 2012, but I did install it on both a Windows Server 2008 and Mac OS X 10.11.6 server; both running FileMaker Server 15.0.1.
After launching FileMaker Pro, I went to Open Remote, added the current host IP Address to show all files, and I'm able to access and open all files. I am able to access Manage Database and add/edit/delete tables and fields, and then save them. I can also go into the Script Workspace and add/edit/delete scripts and save them.
Let me know what else I can do to replicate the crashing.