Steps To Reproduce

• Go to location http://maps.secondlife.com/secondlife/Fluffy/203/159/17 and look out over the water.

• Compare how the scene renders on EEP viewer Second Life Release 6.4.0.538312 (64bit) and default release viewer https://releasenotes.secondlife.com/viewer/6.3.7.535996.html with both ALM enabled & ALM disabled.

  Observed Behaviour

• Default release, toggling ALM: https://gyazo.com/e2f8a6ec3a20bc0ba509add834ccf453

• EEP toggling ALM: https://gyazo.com/332445951fc4eb2e806d033347ce8802

• My gifs are taken with graphics settings set to Ultra & with Ambient occlusion & shadows disabled and then toggling ALM.

Shading on the GRID prim

• Observe the GRID prim above your head: https://prnt.sc/rfgx2e

• This is a megaprim with an emissive mask on it I think, but I'm unable to tell without having a modify copy of it.

• Observe that on the default release viewer, the GRID prim lines lit up/glows with both ALM enabled & ALM disabled.

• Observe that on the EEP viewer, the grid prim lines are just black when both ALM is enabled & ALM is disabled.

• Observe that if you look straight up, the grid prim lines will turn red.

{
  'Build Id': 'unset',
  'Business Unit': ['Platform'],
  'ReOpened Count': 0.0,
  'Severity': 'Unset',
  'System': 'SL Viewer',
  'Target Viewer Version': 'viewer-development',
  'What just happened?': 'Filling in...',
  'What were you doing when it happened?': '....',
  'What were you expecting to happen instead?': '....',
  'Where': 'http://maps.secondlife.com/secondlife/Fluffy/203/159/17',
}