Hello,

We have a hub with several BigWig tracks, and we're having problems using 
"always zero" and "transparent mode".

The goal is to create a view similar to the H3K27Ac Mark Encode tracks ( 
http://genome.ucsc.edu/cgi-bin/hgTrackUi?hgsid=263551753&c=chr21&g=wgEncodeRegMarkH3k27ac
 ) .

Our hub passes "hubCheck" without warnings and loads correctly on the Genome 
Browser, but two problems remain:

1. "alwaysZero on" is ignored, the tracks do not always start at zero (if the 
minimum value is higher than zero), although the hgTrackGUI does show 
"on" for "always show zero".

2. The tracks are shown in the correct color, but are solid and not transparent.

The parent track is defined as:
===
track Foo
container multiWig
noInherit On
type bigWig
shortLabel +Foo
longLabel +Foo RNAseq data
visibility full
autoScale On
alwaysZero On
showSubtrackColorOnUi on
aggregate transparentOverlay
===

Each sub-track is defined as:
===
track Foo_rep1_plus
bigDataUrl 112_rep1.bw
shortLabel Foo_rep1_plus
longLabel Foo_rep1_plus
parent Foo
type bigWig
autoScale On
alwaysZero On
color 159,159,159
===

I can share the hub URL off-list, if needed.


Any suggestions would be appreciated, 

Thanks,
 -gordon
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