I had an issue where, after upgrading from 1.8.0-rc1 to 1.8.0-rc2, no
receiver output was shown in the Wide Graph and no signals (e.g., FT8
or JT65) were decoded. It turned out that WSJT-X.ini had a UseRef=true
line in the [WideGraph] section. Changing it to false fixed the issue.

For me, this is completely reproducible. I have both 1.8.0-rc1 and
1.8.0-rc2 on Windows 10. They are installed in separate directories,
but use the same WSJT-X.ini in my AppData\Local\WSJT-X directory. With
1.8.0-rc1, presence of UseRef=true does not cause any apparent
decoding problem. Also, I can go to the Wide Graph window and toggle
"Ref Spec" off and on, without any apparent change to how many signals
are displayed or decoded.

With 1.8.0-rc2, the behavior for UseRef=true is entirely different.
Nothing new appears in the Wide Graph window except the periodic green
horizontal lines. Under Band Activity, no decodes are listed. If I
toggle "Ref Spec" off, signals immediately appear and decoding works.

I didn't have a good reason for leaving UseRef=true configured (i.e.,
leaving Ref Spec checked). However, the issue may affect other users,
and seems relatively hard to track down: it's not obvious that a graph
configuration would affect whether decoding occurs. A user might
instead surmise that their sound device was incompatible with
1.8.0-rc2. In general, I'm not sure that the program should silently
honor a UseRef=true WSJT-X.ini setting. I can't think of a reason why
a user would want to permanently configure a "Compute and save a
reference spectrum" action for every time the program starts, and then
manually toggle "Ref Spec" off afterward. I suspect that UseRef=true
tends to be in WSJT-X.ini accidentally, disrupting a user's ability to
enjoy the wonderful 1.8.0-rc2 upgrade!

(I'm guessing that this is the result of differences in the
"if(buseref) then" code block of lib/refspectrum.f90 between 1.8.0-rc1
and 1.8.0-rc2, but I don't know.)

Matt, KA1R

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