Who's Online list is not updating

[NerdCore]

Hello,

Our problem is that the block("who's online") on the first page of the forums doesn't get updated. I tried manually running the task to clear system cache under the automatic tasks menu. This did not help.
The only way it gets updated is if we manually use the tool under "get support" -> "clear system caches"

It worked fine on the earlier version, but after the update this happened. We haven't found any errors being triggered regarding this.

Going to "index.php?/online/" shows the correct members online.

[NerdCore]

Thanks for Jim from the support team. Found a solution:
The new update had reset our "cache sidebar, header and footer blocks" setting in ACP.
  It works now correctly.