on the event time line page, it's show this error :
Notice: Undefined variable: filter_query in /var/www/zoneminder/htdocs/zm_html_view_timeline.php on line 1201
because is not checked if this variable exist.
Steps to Reproduce:
1.go on page events, show timeline
$filter_query is used without verify if it exist
$filter_query set to "" if not exist
Created attachment 163673 [details]
add zm_html_view.php patch
Created attachment 163675 [details, diff]
$filter_query patch for zm_html_view_timeline.php
emerge zoneminder -pv
These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild R ] www-misc/zoneminder-1.23.3-r1 USE="ffmpeg -X10 -debug" 0 kB 
Total: 1 package (1 reinstall), Size of downloads: 0 kB
Portage tree and overlays:
Thanks for the patch!
Assigning to maintainers.
Thanks for the patch Michele but this is an upstream issue and you need to submit your patch there.