I have run most revisions since r6373 and at the moment am running r4848 and 
never
had a crash while decoding yet.

I have windows 7 with all updates installed. It is a six core amd unit with 
8GB ram.

WSJTX is set for decode deepest and the waterfall to bins/pixels 3 and the 
default
jt65 2500 jt9

Using split mode on my ic-7000  I can operate anywhere displayed on the 
waterfall with no issues.

The system is left on most of the time, with random downtimes to allow the 
missus to run her
version or to see if there are any issues with the latest builds.

Your 1st update is for explorer which I don't use anyway (I use firefox and 
chrome) though as explorer
is integral to windows I would think I have the update.

The 2nd update seems to be causing issues for some and nothing for others 
regardless of if they use
wsjtx or any ham related software.

I'm wondering if the issues are hardware/software rather than just software 
?, not saying that there is
a problem with your hardware but there are so many pc configurations it 
could be something totally
random causing these issues.

Regards Richard m0clz

-----Original Message----- 
From: Paul DU2/WA8UGN
Sent: Tuesday, December 23, 2014 6:16 AM
To: [email protected]
Subject: [wsjt-devel] Possible Detection/Fix for KV Decoder Errors w/Windows 
OS

After extensive testing, and with the aid of Julian, VK4CMV, who confirmed
the existence of the exact same errors occurring with his WSJT-X
operations, I come to the conclusion that changes to Microsoft Windows via
periodic Windows updates, may be a major player in error activity.

Testing was done on 3 different versions of WSJT-X (r3673, r4400, & r4633)
in total isolation from the world, save "on-air" signal input.  Almost
every permutation of disabling software, option settings, etc. were
employed in a very large number of tests.  Each test was performed after a
complete scrubbing of my laptop's hard drive, memory, and drivers.  No
positive effects were observed during the tests.

I finally uninstalled every Windows update placed into service in Dec 2014,
and re-tested.  Results were most encouraging, with long runs of each
WSJT-X version before a hiccup.  Hiccups were cured by restarting WSJT-X
(not the optimum resolution, but much better than others found to date).

Final confirmation of WSJT-X - Windows interaction having some relationship
to the errors observed came when each Windows update was individually re-
installed.  No change to the much improved operation of WSJT-X versions was
observed until two different updates were installed.  Each caused a slow-
down of decoding, increased errors, and frequent Decode lock-ups.

The "offending" Windows Updates are:

     KB3025390 - major "offender"
     KB2952664 - minor "offender"

With these two Windows updates uninstalled, and everything but the kitchen
sink attached to the laptop and every bit of software normally used in weak
signal operations here running, the results of testing were impressive.
Fast decoding (I use "Deepest" decoding), and a noteworthy improvement in
mean time between errors.  Best, only one decoder lock-up over 6+ hours of
testing.  If a KV error occurs, with or without the pop-up error window,
normal operation continues.  The pop-up error window can be closed when it
appears - no observable deterioration in normal operations occur when that
pop-up appears, nor when it is manually closed.

Any thoughts about this line of testing and its results?

Best 73,

Paul DU2/WA8UGN


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