System Information
Operating system: Mac OS
System: MacBook Pro 13" 2017
Graphics card: Intel Iris Pro 650

Blender Version
2.80 Beta for Mac OS

It seems there are three problems wich I encountered on the 2.8 Beta:

1.) The first problem occurred when I tried to open an HDRI File. I could load the HDRI file in a fresh new file as long as I loaded the image file in the devlook viewport mode into the world shader node. Switching to the rendered viewport setting afterwards worked. But as soon as I loaded the hdri file into the world shader node while having the viewport in rendered mode it didn't worked. I read that other users also had this Problem.

2.) Another problem I ran into was, that material changes while displaying rendered viewport with eevee didn't effect the viewport. Also the material preview wasn't affected by the changes. Somehow the changes worked after using the undo command! As a workaround I did two changes in a material node f.e. changing the roughness twice, then doing one undo command and the first change was shown in the rendered viewport.

3.) also had some problems that objects wouldn't show textures even with the proper uv unwrapping and mapping. Even on simple objects like a cube or a plane. However after some time fiddling around with the problem, magically after switching between editing and object mode at some point the textures appeared. I think there could be some kind of texture-display error concerning the edit mode.

Otherwise great work! im really looking forward to the 2.8 stable release!

Greetings from Germany,

Moritz

Exact steps for others to reproduce the error
Based on the default startup file.