We are using perforce for our project. Sometimes, after I get latest rev
1 - That has new material (that requires compling shaders)
2 - And doesnt have any changes to lightbuild data
Editor can open the map while compling shaders(I can use the map while its compling). But as soon as compling is finished, editor crash. We found that this is caused by lightbuild data. After I delete that, editor opens the map and complies shaders and editor wont crash.
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Consider deleting Saved, Intermediate, Binaries. (Make sure your C++ code can compile.) Compiled shaders are stored in a folder called DerivatedDataCache that you should clear out too. These actions should effectively remove all data that can be created by Unreal, and is effectively a nice reset.