Indeed I do use a caching plugin (W3 Total Cache) and I had cleared its cache, even tried to disable the plugin. However, as I already planned to switch to WP Super Cache I changed the plugin and cleared my browser’s cache – it works again. Thank you for the support.
Seem to be having the same issue on one of my sites as well. Settings are not updated, and all the console prompts is;
[“Settings updated.”]
0: “Settings updated.”
length: 1
__proto__: Array(0)
Furthermore on the database tab, when pressing “run optimization” the page freezes and nothing happens. Selecting “run all selected optimizations” prompts a dialogue message saying “This operation is permanent. Continue?”, pressing OK takes me to a new page stating, “link is not valid anymore”. Also, the tables-tab is blank so there seem to be something fishy with the connection to the dB. It worked well prior to version 2.2.7.