Hi Daniel,
Using mobileapp.moodledemo.net or localhost with chromium produces the same problem as you can see on this image (I surrounded the loading spinner with a red circle)
On the other hand, when using chrome with mobileapp.moodledemo.net I don't have this error, but my custom mobile css file from mobile config in my site cannot be loaded because of Access-control-allow-origin errors
Failed to load https://moodle-test.test.fundp.ac.be/jrm/local/unamur/receptic-mobile.css#4: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://mobileapp.moodledemo.net' is therefore not allowed access.
main.js:3444 9/10/2018 10:35:22 CoreWSProvider: Error downloading https://moodle-test.test.fundp.ac.be/jrm/local/unamur/receptic-mobile.css#4 to sites/faaf9b5a526865acea02ad03caf899da/filepool/receptic-mobile.css_4_a88abb177cd22601145fd0a057a76356 FileTransferErrorMock {code: -1, source: "https://moodle-test.test.fundp.ac.be/jrm/local/unamur/receptic-mobile.css#4", target: "filesystem:https://mobileapp.moodledemo.net/persis…mobile.css_4_a88abb177cd22601145fd0a057a76356.tmp", http_status: 0, body: "", …}body: ""code: -1exception: nullhttp_status: 0source: "https://moodle-test.test.fundp.ac.be/jrm/local/unamur/receptic-mobile.css#4"target: "filesystem:https://mobileapp.moodledemo.net/persistent/sites/faaf9b5a526865acea02ad03caf899da/filepool/receptic-mobile.css_4_a88abb177cd22601145fd0a057a76356.tmp"__proto__: Object
(anonymous) @ main.js:3444
(anonymous) @ main.js:48186
t.invoke @ polyfills.js:3
onInvoke @ vendor.js:5134
t.invoke @ polyfills.js:3
r.run @ polyfills.js:3
(anonymous) @ polyfills.js:3
t.invokeTask @ polyfills.js:3
onInvokeTask @ vendor.js:5125
t.invokeTask @ polyfills.js:3
r.runTask @ polyfills.js:3
o @ polyfills.js:3
e.invokeTask @ polyfills.js:3
p @ polyfills.js:2
v @ polyfills.js:2
load (async)
O @ polyfills.js:2
t.scheduleTask @ polyfills.js:3
onScheduleTask @ polyfills.js:3
t.scheduleTask @ polyfills.js:3
r.scheduleTask @ polyfills.js:3
r.scheduleEventTask @ polyfills.js:3
(anonymous) @ polyfills.js:2
r.set @ polyfills.js:2
(anonymous) @ main.js:112436
t @ polyfills.js:3
FileTransferObjectMock.download @ main.js:112405
(anonymous) @ main.js:48145
t.invoke @ polyfills.js:3
onInvoke @ vendor.js:5134
t.invoke @ polyfills.js:3
r.run @ polyfills.js:3
(anonymous) @ polyfills.js:3
t.invokeTask @ polyfills.js:3
onInvokeTask @ vendor.js:5125
t.invokeTask @ polyfills.js:3
r.runTask @ polyfills.js:3
o @ polyfills.js:3
Promise.then (async)
r @ polyfills.js:3
t.scheduleTask @ polyfills.js:3
onScheduleTask @ polyfills.js:3
t.scheduleTask @ polyfills.js:3
r.scheduleTask @ polyfills.js:3
r.scheduleMicroTask @ polyfills.js:3
f @ polyfills.js:3
c @ polyfills.js:3
(anonymous) @ polyfills.js:3
main.js:3444 9/10/2018 10:35:22 AddonRemoteThemesModule: Error loading site after site update FileTransferErrorMock {code: -1, source: "https://moodle-test.test.fundp.ac.be/jrm/local/unamur/receptic-mobile.css#4", target: "filesystem:https://mobileapp.moodledemo.net/persis…mobile.css_4_a88abb177cd22601145fd0a057a76356.tmp", http_status: 0, body: "", …}
I can test the app this way but not my custom styles...
Thanks for your help