Some dashboard widgets never load

I have a fresh install of TrueNAS and these widgets never seem to finish loading (the blue animation at their top keeps running forever): Memory Usage, CPU Usage, CPU Temperatures, Load Average. Primary NIC is also partially broken. Disks and the "about" widget look fine.

The following error is logged to the browser's console:

ERROR TypeError: "t[0] is undefined"

mergeMessages http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

startBroadcast http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

updateSources http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

t http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

__tryOrUnsub http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

next http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

_next http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

next http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

next http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

emit http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

callWebsocket http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

__tryOrUnsub http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

next http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

_next http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

next http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

onmessage http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

x http://freenas.local/ui/polyfills.4e42ab25a6112b333361.bundle.js : 1

i http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

invokeTask http://freenas.local/ui/polyfills.4e42ab25a6112b333361.bundle.js : 1

onInvokeTask http://freenas.local/ui/main.0577d08d48bf3965712d.bundle.js : 1

invokeTask http://freenas.local/ui/polyfills.4e42ab25a6112b333361.bundle.js : 1

runTask http://freenas.local/ui/polyfills.4e42ab25a6112b333361.bundle.js : 1

invokeTask http://freenas.local/ui/polyfills.4e42ab25a6112b333361.bundle.js : 1

m http://freenas.local/ui/polyfills.4e42ab25a6112b333361.bundle.js : 1

b http://freenas.local/ui/polyfills.4e42ab25a6112b333361.bundle.js : 1

Using Firefox 66.0.3 (64-bit).