After changing my renderer, I noticed that a lot of my work has been modified in the timeline. Why?

[Tyrannax]

Hey all! So I was working on my first video and decided to throw in motion blur for some of my B-roll. Well, this caused my playback screen to lag big time, and eventually the screen went black for whatever reason- so I searched for a solution online.

I saw that a common "fix" was to switch the renderer from CUDA to Mercruy Playback Engine Software Only. This did solve the black screen problem and the playback was smoother, but I noticed that all my effects are completely different when using the different render (i.e. the position of an effect will be completely different than how I had it on CUDA). So, when I switch back to CUDA, ALL of my effects shift along with it. 

Why is this happening? And how can I fix it? P

Thanks a bunch for any help! This is a very frustrating problem to say the least.

[Peru Bob]

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premi...
Then try pressing Enter to render the timeline .

[Tyrannax]

Thank you for the reply! Unfortunately, I'm still getting the black screen, and changing renderers still changes my effects completely. Is this just a Premier bug? 

[Peru Bob]

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premi...

If that doesn't work, try resetting the preferences:
https://community.adobe.com/t5/premiere-pro/faq-how-to-reset-trash-preferences-in-premiere-pro/td-p/...

If that doesn't work, try resetting the Workspaces:
Reset a workspace
Reset the current workspace to return to its original, saved layout of panels.
1. Do one of the following:
• Click the Workspace menu icon and select Reset to Saved Layout.
• Choose Window > Workspace > Reset to Saved Layout.
from here:
https://helpx.adobe.com/premiere-pro/using/workspaces.html

If that doesn't work, try Preferences > Audio Hardware and set Input to None.

If that doesn’t work, try updating or rolling back your graphics driver directly from the video card manufacturer’s site. If NVIDIA, do a clean installation of the latest Studio Driver (NOT the Game Driver)

If that doesn't work, try creating a new project and import the old one into it.