[Observium] Graphs broken after update

Hi to all. My observium worked perfect for about a month. But yesterday i made an update (to rev. 4572): #cd /opt/observium #svn update #./discovery.php -h none

After that i have next problem: - in servers overview tab all graphs ok - when i'm clicking for example on Memory Usage graph, all is ok. I can see graph for last 24 hours - but when i'm clicking on Show legend/Graph previous/etc there is no graph

Thanks for your help, and sorry for my english.