The browser console text says:
kibana#/home?_g=():372 Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'unsafe-eval' 'nonce-b5qHXrSTHq59PM2x'". Either the 'unsafe-inline' keyword, a hash ('sha256-SHHSeLc0bp6xt4BoVVyUy+3IbVqp3ujLaR+s+kSP5UI='), or a nonce ('nonce-...') is required to enable inline execution.

bootstrap.js:10 ^ A single error about an inline script not firing due to content security policy is expected!

vendors.bundle.dll.js:600 INFO: 2019-08-13T08:16:09Z Adding connection to http://localhost:5601/elasticsearch

Verbose Level:
vendors.bundle.dll.js:493 [Violation] 'setTimeout' handler took 142ms vendors.bundle.dll.js:499 [Violation] 'load' handler took 152ms vendors.bundle.dll.js:499 [Violation] 'load' handler took 220ms

The verbose kibana output while clicking on "Roles" and then on "Create Role":
ops [08:33:09.663] memory: 213.7MB uptime: 0:19:59 load: [0.00 0.00 0.00] delay: 0.098
log [08:33:09.815] [debug][plugin] Checking Elasticsearch version
log [08:33:11.737] [debug][kibana-monitoring][monitoring] Received Kibana Ops event data
log [08:33:11.738] [debug][kibana-monitoring][monitoring] Received Kibana Ops event data
log [08:33:11.739] [debug][basic][security] Trying to authenticate user request to /api/security/v1/me.
log [08:33:11.740] [debug][basic][security] Trying to authenticate via login attempt.
log [08:33:11.740] [debug][basic][security] Username and password not found in payload.
log [08:33:11.740] [debug][basic][security] Trying to authenticate via header.
log [08:33:11.741] [debug][basic][security] Authorization header is not presented.
log [08:33:11.741] [debug][basic][security] Trying to authenticate via state.
log [08:33:11.743] [debug][basic][security] Request has been authenticated via state.
respons [08:33:11.738] GET /api/security/v1/me 200 14ms - 9.0B
log [08:33:12.011] [debug][basic][security] Trying to authenticate user request to /api/security/role.
log [08:33:12.011] [debug][basic][security] Trying to authenticate via login attempt.
log [08:33:12.011] [debug][basic][security] Username and password not found in payload.
log [08:33:12.012] [debug][basic][security] Trying to authenticate via header.
log [08:33:12.012] [debug][basic][security] Authorization header is not presented.
log [08:33:12.013] [debug][basic][security] Trying to authenticate via state.
log [08:33:12.033] [debug][basic][security] Request has been authenticated via state.
respons [08:33:12.010] GET /api/security/role 200 35ms - 9.0B
log [08:33:12.326] [debug][plugin] Checking Elasticsearch version
log [08:33:13.142] [debug][kibana-monitoring][monitoring] Received Kibana Ops event data
log [08:33:13.143] [debug][kibana-monitoring][monitoring] Received Kibana Ops event data
log [08:33:13.372] [debug][basic][security] Trying to authenticate user request to /api/security/v1/users.
log [08:33:13.373] [debug][basic][security] Trying to authenticate via login attempt.
log [08:33:13.373] [debug][basic][security] Username and password not found in payload.
log [08:33:13.374] [debug][basic][security] Trying to authenticate via header.
log [08:33:13.375] [debug][basic][security] Authorization header is not presented.
log [08:33:13.375] [debug][basic][security] Trying to authenticate via state.
log [08:33:13.377] [debug][basic][security] Request has been authenticated via state.
respons [08:33:13.371] GET /api/security/v1/users 200 21ms - 9.0B
log [08:33:13.396] [debug][basic][security] Trying to authenticate user request to /api/security/v1/me.
log [08:33:13.398] [debug][basic][security] Trying to authenticate via login attempt.
log [08:33:13.399] [debug][basic][security] Username and password not found in payload.
log [08:33:13.399] [debug][basic][security] Trying to authenticate via header.
log [08:33:13.400] [debug][basic][security] Authorization header is not presented.
log [08:33:13.400] [debug][basic][security] Trying to authenticate via state.
log [08:33:13.402] [debug][basic][security] Request has been authenticated via state.
respons [08:33:13.395] GET /api/security/v1/me 200 15ms - 9.0B
log [08:33:13.414] [debug][basic][security] Trying to authenticate user request to /api/saved_objects/_find?type=index-pattern&per_page=10000.
log [08:33:13.415] [debug][basic][security] Trying to authenticate via login attempt.
log [08:33:13.416] [debug][basic][security] Username and password not found in payload.
log [08:33:13.417] [debug][basic][security] Trying to authenticate via header.
log [08:33:13.417] [debug][basic][security] Authorization header is not presented.
log [08:33:13.418] [debug][basic][security] Trying to authenticate via state.
log [08:33:13.420] [debug][basic][security] Request has been authenticated via state.
respons [08:33:13.412] GET /api/saved_objects/_find?type=index-pattern&per_page=10000&page=1&default_search_operator=OR 200 27ms - 9.0B
log [08:33:13.442] [debug][basic][security] Trying to authenticate user request to /api/security/privileges?includeActions=true.
log [08:33:13.443] [debug][basic][security] Trying to authenticate via login attempt.
log [08:33:13.443] [debug][basic][security] Username and password not found in payload.
log [08:33:13.444] [debug][basic][security] Trying to authenticate via header.
log [08:33:13.444] [debug][basic][security] Authorization header is not presented.
log [08:33:13.444] [debug][basic][security] Trying to authenticate via state.
log [08:33:13.449] [debug][basic][security] Request has been authenticated via state.
respons [08:33:13.441] GET /api/security/privileges?includeActions=true 200 35ms - 9.0B
log [08:33:13.506] [debug][basic][security] Trying to authenticate user request to /api/features/v1.
log [08:33:13.508] [debug][basic][security] Trying to authenticate via login attempt.
log [08:33:13.508] [debug][basic][security] Username and password not found in payload.
log [08:33:13.518] [debug][basic][security] Trying to authenticate via header.
log [08:33:13.520] [debug][basic][security] Authorization header is not presented.
log [08:33:13.537] [debug][basic][security] Trying to authenticate via state.
log [08:33:13.548] [debug][basic][security] Request has been authenticated via state.
respons [08:33:13.493] [access:features] GET /api/features/v1 200 108ms - 9.0B
ops [08:33:14.661] memory: 196.7MB uptime: 0:20:04 load: [0.00 0.00 0.00] delay: 0.097
log [08:33:14.828] [debug][plugin] Checking Elasticsearch version