System Information
Operating system: Mac OS X Mojave
Graphics card: Intel Iris HD640

Blender Version
Broken: 2.80, c0c1b4542f39, master, 2019-06-24

Short description of error

1. Blender crashes on loading blend files set as a startup file that references objects and/or other datablocks linked from another blendfile. The console outputs that linked objects failed to load. The same blend file works just fine if it is opened in a regular way after Blender has already opened.
2. Trying to edit a linked image in Texture Paint mode produces a crash. (The possibility should be blocked same to mesh editing, material editing, etc?)