Hey Epic,
Over the past few days there has been some strange issues with Unreal Engine 4.8 and 4.8.1 for me that has made it really hard to use unreal engine.
Here is what I have experienced -
Partial Asset Corruption - Example: The Epic first person Skeletal mesh that I imported last night corrupted itself - I am uploading this asset to my Google Drive. This is the default Epic First Person Shooter Skeleton. The skeleton is no longer there according to unreal engine.
Materials not retaining properties - Example: Materials are not retaining Textures in Texture 2d and Param2d slots. Not sure what to do here. Should I upload an example?
Typically this happens when I import assets into a project. Either through copy and pasting it into the content folder or the migrate asset option.
Keep in mind that I have migrated my project from 4.8 Preview 4 to 4.8.1
I have also gone ahead and uploaded the log files from the log folder.
Google Drive -
Log Files
Hi HeadClot -
Can you be very specific by what you mean by Import? Typically you should not have to migrate or import anything from a Preview Version of the Engine to the full Version. You would only be asked to open a copy of your project if you are going from version 4.7 to 4.8. 4.8 Preview 4 to 4.8.1 should not trigger any warning as they are the same engine version with some bug fixes.
I can see from the project files you uploaded that there is an issue with the assets, but this is somewhat normal when you copy and paste the project files from one project to another without the Migrate feature. The Redirectors can get broken if not migrated properly from the engine.
Let us know -
Eric Ketchum
Can you be very specific by what you
mean by Import?
Copy or migrate an .uasset from an content folder of one project into the content folder of another project.
I can see from the project files you
uploaded that there is an issue with
the assets, but this is somewhat
normal when you copy and paste the
project files from one project to
another without the Migrate feature.
The Redirectors can get broken if not
migrated properly from the engine.
I might have copy and pasted them into the content folder opposed to used the migrate feature in UE4.
Let me try something and I will get back to you. If it does not work then I will let you know. If it does work I will let you know. 
Hey @eric-ketchum
OK, so I did not Migrate assets over from one project to another I copied them from the content directory.
This causes a problem when I copy (Not Migrate) them out of the content directory to the destination folder.
Hey HeadClot -
Yeah copying and pasting will not save some redirector information that migrating will keep. The good news is that all the assets should still be there, but you will have to replace the information in Materials, Blueprints and Particle Systems.
Thank You
Eric Ketchum