In the Beta program, someone else pointed out this problem, but it still exists in the release. If I share a map as Runtime content (ArcMap 10.3PR), and domain names contain spaces, Runtime for .NET throws an "Item not found in the database" exception when I try to open a feature table. This appears to be specific for .NET, as I can open the same gdb in Runtime for Qt and display layers. Is there a way to submit this as a bug? The online support center doesn't list Runtime for .NET as a product yet.