Polls just stopped wroking

Hi!

I am using this lovely plugin for months now, but some days/1-2 weeks ago, it just stopped. Nothing happened, I didn’t update anything at that time, just my users notified me that they can’t vote. The polls were still there, but the vote button went “inactive”, it was grey/white and couldn’t be clicked. ?? Any idea? I disabled all the other plugins. but it didn’t help. ??

https://www.ads-software.com/extend/plugins/wp-polls/