Hi all, 

I'm seeing a regression for a netcdf image mosaic layer when upgrading from 
2.5 to 2.5.1. Starting from a given zoom level, all tiles simply go black. 
There's also a variation where a set of evenly spaced tiles go black, while 
others remain normal for a given zoomlevel, and then they all return black at 
the next zoom level.

I've been looking for the source now for a while, but haven't been able to 
figure it out. Here are some more clues I gathered:
-the changes in gt-imagemosaic do not seem to influence the behavior
-the netcdf layer has 3 bands which are merged using the MergeBehavior.Stack, 
a  similar single banded mosaic, built from the same source data works fine.
-changing the imageio-ext library version does not seem to affect the issue

I'll continue looking myself, but if this rings a bell somewhere then I'm 
certainly interested. I also scanned the diff on github, but there's are not 
that many changes to the relevant code.

thanks,
Jeroen

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