Hello.. i am sorry if my english bad.

1. I have trouble my featured images course not showing (BLANK), i already upload course image but still nothing.. 

2. I cant change / edit course image..the command is always You must not attach more than 1 files here.

3. Then when i want to upload logo or any images the file picker spinning (loading)

This happend when i upgrade to moodle 3.9.  I already do the things in forum like : 1. Clear all purge cache, 2. Clear Cache and Cookies, 3. Uncheck YUI combo loading and Cache Javascript, 4. and custome_menu plugin (i didnt find custome_menu plugin)

note : i already change themes with boost and moove still the same problem

I hope theres somebody can help me..thank you..