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This issue has been around for a while, but I didn't see it listed so thought I'd send a ping. Pardon if it has been raised elsewhere. I have duplicated this on 1.78 and 1.93, don't recall if it was an issue before but I believe it was.

Setup:
In main window select View -> Select Sidebar Computer selection checkbox.
In main window, computers will be listed, but column width may truncate longer computer names.
Attempting to adjust column width interacts with adjusting width of entire window, and results in Computer selection sidebar disappearing entirely. At that point, it is impossible to get the column back.
Closing the main window and reopening it will not restore the missing column. It is necessary to quit  entirely and restart to get the column back and, again it will not be able to be adjusted in width.

Low priority issue to me, definitely. More a matter of curiosity.
I see this 2-3 times per day. Seems to happen when there's a fair amount of traffic caused by activity from project servers (e.g. downloading a slug of new tasks, change of work venue, etc).

03 May 2019 - 01:40:54 OnTimerDlg ---- Thread timeout, will restart.
03 May 2019 - 01:40:54 BoincTasks is closing down all threads, this may take a couple of minutes.
03 May 2019 - 01:40:58 BoincTasks has closed down all threads

Occasionally, one of the computers on the network apparently fails to respond:

03 May 2019 - 01:40:58 ERROR: Not closed down properly ---- [machine name]  Suspended

No real problems result from this, other than the crash itself, and everything restarts in a minute or two. Just wondering what the cause is, and if there's something I can do to minimize occurrences.
At present, given the configuration detailed below, BT is tracking 2000 tasks on SETI, and sometimes added tasks if other projects are active.

Current configuration is as follows:
1 - general use PC
     Xeon 3ghz hexacore
     running BT 1.78 on Win10, BOINC 7.12.1, monitoring dedicated crunchers
     Avg. CPU utilization < 90%,
     plenty of memory and SSD disk space
     3 NVidia GPUs
     LAN stats:
         DL Rate:  5.3 MB/s avg, 8.9 MB/s max
         UL Rate:  112 KB.s avg, 6.0 MB/s max
4 - dedicated SETI crunchers
     2 - Xeon 3ghz hexacore,         Win10, 1 - BOINC 7.12.1, 1 - BOINC 7.14.2, 3 NVidia GPUs ea.
     1 - dual Xeon 3ghz hexacore, Win10, BOINC 7.12.1, 3 NVidia GPUs
     1 - Xeon 3 ghz Core2Quad,     Win7,   BOINC 7.12.1, 4 NVidia GPUs
     Avg. CPU utilization > 90%
     plenty of memory and SSD disk space, LAN stats insignificant
Network - all 1gb wired connects via 2 gigabit switches
    No indication of network blockage or other LAN issues.

While utilization is high, none exhibit slow mouse, kybd or other response or other issues when used at at console.
Just wondering if there's anything I can do to tune this, or if it's just a hard-coded timer a machine intermittently fails to meet due to loading, or 

Would be interested in any thoughts?
Many thanks!

[posted this a couple months ago at 1/75 beta but no response so reposting]
Just loaded 1.75, and decided to test the new ability of editing app_config.xml.
Setup here is as follows:
1) Core2 Q9650, Win10ProX64, BT 1.75, BOINC 7.8.3, Projects: SETI, Einstein
2) Xeon E5450, Win7ProX64,                   BOINC 7.8.3, Projects: SETI, Einstein
3) Xeon X5675, Win10ProX64,                 BOINC 7.8.3, Projects: SETI, SETI Beta, Einstein
4) Xeon X5675, Win10ProX64,                 BOINC 7.8.3, Projects: SETI, SETI Beta, Einstein
Installation file paths are standard for BOINC and BT on all machines.

From machine 1) under Projects tab was able to load and read app_config for Einstein and SETI Beta on all machines (SETI uses app_info on all).
However, after making a change to Einstein on all 4 machines and to Beta on the two machines running it:
Syntax Check passes,
Apply passes,
A subsequent attempt to load app_config yields an "Invalid" window message in each case.

Further checking shows that each app_config is now file size 0 and all data has been lost.

Stupid me, of course, for not having made backups before testing a new feature, and for not having validated everything on 1 machine before moving on to the other three.
But I thought I would mention this for anyone else testing, to see if there's something else I did to screw this up or info I can provide to help find a resolution.
If I might also suggest, perhaps it would be good to have BT make a .BAK backup file of app/cc_config XML files before making changes to them, if that is possible.
Feel free to let me know how I might help! Thanks!

[edit 1]
It seems app_config editor is failing syntax check on <gpu_versions> statement. 
CC_Config editor is failing syntax check on <cc_config> tag.
Falling back to 1.73.

[edit 2]
Unable to fall back to version 1.66 or 1.73, as running installer gives error:
Open file:C:\Program Files\eFMer\BoincTasks\lang\BoincTasks_ENU.btlang
Group: <GroupMenuMain> string header in pos 225, <ExtraEditAppInfo> not found
Group: <GroupDialogRules> string header in pos 951, <EventSuspendNetwork> not found
Group: <GroupDialogRules> string header in pos 952, <EventResumeNetwork> not found