"Add a reminder" not working

[Philip220571]

In the Manage folder, when I need to send a reminder immediately I can select "right now", and I can select who I want to sent the reminder to (and I can include a message as an option also) .... BUT ... there is no button "OK" or "Cancel" at the bottom of this small window ... so the Reminder cannot be finalized and sent. To switch off this window the only way is to press on the ESC key.

How can you finalise/sent a reminder without such button "OK" (or equivalent like ) ??

The funny thing is that it previously did work and suddenly it does not anymore ...