First, just have to ask, do you use the latest nvidia drivers? there is an old for-loop bug in old nvidia drivers.
Second, to verify this bug, change 2 lines in 08_pp_bloom.lua to use LE own blur shaders (which doesn't use for-loops)
self.shader_hblur = Shader:Load("Shaders/PostEffects/00_shaders/_hblur.shader")
self.shader_vblur = Shader:Load("Shaders/PostEffects/00_shaders/_vblur.shader")
to
self.shader_hblur = Shader:Load("Shaders/PostEffects/Utility/hblur.shader")
self.shader_vblur = Shader:Load("Shaders/PostEffects/Utility/vblur.shader")
Is it still yellow?