Big Problems With Ue4

Hi, i have overwritten textures in a landscape material while the project was running. I did it several times but since i did it last time ue4 gives me big problems. No Matter what Project i have open now, ue4 stutters. For example:

Map is loaded. I fly above the map and it stutters. If i press “space” while pressing “w” it sutters way less etc its crazy behavior. The Problem imo is in ue4, not the project itself. Im not sure how to fix this. Is there a way to repair or…

On my most important project i cant use the mannequin anymore…rly need help

Im using 4.26

in the launcher under the engine number click the drop down button and select verify. It will satrt repairing the engine if there is anything wrong with it.