I put the plugins/runtime and then copied shader to engine/shaders. The 4.1.1 window pops up saying compiling shaders WorldGridMaterial and immediately shuts down and the engien does not start , so I copied the 4.1.1 source shader folder back, and then the engine lanched and when i enabled fluid , when restarting, I got the same message on launcher pop up window shaders WorldGridMaterial nad the engine launched and was compiling some shaders. Did I make the work correctly by only copying the in plugins/runtime and then copying back 4.1.1 shader folder thus deleting the shaders you uploaded or do I need your shadre folder that does not work?