Issue is seen in windows too..

Good Build: 61.0.3117.0 dev
Bad Build: 61.0.3118.0 dev

Able to repro the issue on 61.0.3119.0 on Mac OS 10.12.5. For repro, try to restore Devtools to defaults and reload.

Using per revision bisect providing information below.

Bisect Information:
--------------------
You are probably looking for a change made after 476155 (known good), but no later than 476156 (first known bad).

Change Log URL:
https://chromium.googlesource.com/chromium/src/+log/ce954697f872bb3f9baafc7e49655e48a2121e0d..6f9400d2dce36b995fa0da47ca25c3c2bf0b18de
 
From the above change log suspecting below change
Review URL: https://codereview.chromium.org/2915883002

chenwilliam@ - Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Thanks!

 Issue 729011 

NOTE1: No network tab entries are seen on reload of every page. 

NOTE2: On pages like youtube,F1[help page] , entire network tab becomes blank.[Reset devtools to default in these tabs and open network tab]

Hence changing to Dev Blocker.

Inspected devtools and found these errors.[Opened devtools as seperate window and used ctrl+shift+i to inspect devtools of devtools
============================================

inspector.js:8264 Main._createAppUI: 24.991943359375ms
inspector.js:8269 Main._showAppUI: 12.48388671875ms
inspector.js:8270 Main._initializeTarget: 10.7099609375ms
inspector.js:3169 Request Target.setAttachToFrames failed. {"code":-32601,"message":"'Target.setAttachToFrames' wasn't found"}
dispatchResponse @ inspector.js:3169

inspector.js:22 Empty response arrived for script 'chrome-devtools://devtools/bundled/network_priorities/network_priorities_module.js'
evaluateScript @ inspector.js:22

network_module.js:448 Uncaught (in promise) TypeError: NetworkPriorities.uiLabelForPriority is not a function
    at Network.NetworkLogView._refreshRequest (network_module.js:448)
    at Network.NetworkLogView._appendRequest (network_module.js:445)
    at Array.forEach (<anonymous>)
    at Network.NetworkLogView.modelAdded (network_module.js:356)
    at SDK.TargetManager.observeModels (inspector.js:3238)
    at Network.NetworkLogView (network_module.js:311)
    at new Network.NetworkPanel (network_module.js:898)
    at Runtime.sharedInstance (inspector.js:82)
    at Runtime.Extension._createInstance (inspector.js:110)
    at <anonymous>

Deleted: Error in devtools of devtools.png 225 KB

	Error in devtools of devtools.png 225 KB View Download