License key disappears upon saving

Hi,

I repeatedly try to enter my “Ads” license key into the “License Settings” area of the plugin, but when I save and then refresh the page, the field is blank (it doesn’t save).

Screenshot

Is anyone having this problem? I got this to work on one WP site but I’m trying to add it others, without luck.

Help is appreciated.

Best,
Jordan

https://ww.wp.xz.cn/plugins/jw-player-plugin-for-wordpress/