Today I updated all extensions including seblod (3.17.0) and all it's extensions also.
updated joomla to 3.9.1
Php is 7.1.2
max file uploads 50, max input vars 3000,
site is working fine at the front end and all other backend components/ modules/ plugins are working fine.
Only the "+" (plus icon) in every field for typography or links etc. are just showing only blank modal window.
Can anyone let me know what to do now?