some pix can't show correctly after installing PA

[shanqianyu]

HI, all
when i install PA, and monitor, thold as well as settings following some documents, i link to http://xxxx/cacti. yes, i can see four cards in the site. there are console, graphs, thold and monitor. however, when i click monitor, there are some pictures which can't show correctly. when i click thold, it's the same. i don't why.