Just some of fixes and tweaks that worked for me, during my S.T.A.L.K.E.R.: Anomaly gameplay.
In a case of flickering white screen or black screen after installing new shaders the solution is to set proper settings in user.ltx:
shader_param_1 (1.000000, 1.000000, 1.000000, 0.000000)
shader_param_2 (0.000000, 0.000000, 0.000000, 0.000000)
shader_param_3 (1.000000, 1.000000, 1.000000, 0.000000)
shader_param_4 (1.000000, 1.000000, 1.000000, -0.300000)
shader_param_5 (1.000000, 0.000000, 0.000000, 0.000000)
shader_param_6 (0.000000, 1.000000, 0.000000, 0.000000)
shader_param_7 (0.000000, 0.000000, 1.000000, 0.000000)
shader_param_8 (0.000000, 0.000000, 0.000000, 0.000000)
After I encountered some bugs with bloom I managed to fix it with below settings, user.ltx:
r2_ls_bloom_fast on
r2_ls_bloom_kernel_b 0.05
r2_ls_bloom_kernel_g 0.5
r2_ls_bloom_kernel_scale 0.01
r2_ls_bloom_speed 25.