Upgraded to plone 6.1 - Unable to insert images

Hi,

I recently upgraded a few sites from plone 6.0.5 to plone 6.1 (all using Classic UI) and now I cannot insert images via the editor. I've tried this for a new/existing page and a new/existing news article. In each instance when I navigate to the image I want to insert (via the tinymce editor), I click on the image and then the image browser dialog window just freezes. I can see a JS error on the browser webdeveloper console:

"Uncaught (in promise) RangeError: invalid language tag: "en_GB""
f utils.js:221
xg ContentBrowser.svelte:594
Gg ContentBrowser.svelte:590
p 17695.37d8d0dcb04fb8fde263.min.js:1
St await_block.js:99
p 17695.37d8d0dcb04fb8fde263.min.js:1
p 17695.37d8d0dcb04fb8fde263.min.js:1
ht scheduler.js:119
pt scheduler.js:79
promise callbackut scheduler.js:20
ctx Component.js:81
ctx Component.js:139
R 17695.37d8d0dcb04fb8fde263.min.js:1
Y ContentBrowser.svelte:109
w ContentBrowser.svelte:171
vg ContentBrowser.svelte:483
o 17695.37d8d0dcb04fb8fde263.min.js:1
P dom.js:361
m 17695.37d8d0dcb04fb8fde263.min.js:1
m 17695.37d8d0dcb04fb8fde263.min.js:1
k each.js:83
At each.js:118
p 17695.37d8d0dcb04fb8fde263.min.js:1
St await_block.js:99
p 17695.37d8d0dcb04fb8fde263.min.js:1
p 17695.37d8d0dcb04fb8fde263.min.js:1
ht scheduler.js:119
pt scheduler.js:79
promise callback
ut scheduler.js:20
ctx Component.js:81
ctx Component.js:139
vg 17695.37d8d0dcb04fb8fde263.min.js:1
l index.js:56
get ContentStore.js:127
get ContentStore.js:219
update ContentBrowser.svelte:352
ht scheduler.js:115
pt scheduler.js:79
promise callback*ut scheduler.js:20
ctx Component.js:81
ctx Component.js:139
vg 17695.37d8d0dcb04fb8fde263.min.js:1
l index.js:56
$ utils.js:273
Hg 17695.37d8d0dcb04fb8fde263.min.js:1
R dom.js:371
P dom.js:361
m 17695.37d8d0dcb04fb8fde263.min.js:1
jt Component.js:44
m 17695.37d8d0dcb04fb8fde263.min.js:1
jt Component.js:44
Ut Component.js:162
Pg 17695.37d8d0dcb04fb8fde263.min.js:1
init contentbrowser.js:76
utils.js:221:23

I'm not sure what has the "invalid language tag: en_GB" or why it is invalid. Should this just be "en"?

This issues affects all of the CMS users.

Any pointers of where to look would be appreciated.

Regards,

Lee.

Hi, please pin plone.staticresources to the latest 2.2.3 bugfix version and try again. There was a fix for a language code issue lately: fix language identifier for language file by 1letter · Pull Request #1432 · plone/mockup · GitHub