graphs not showing anything with more then 3 hosts(1.4.5)

[Tristan]

i have created a graph with host uptime. When i add more then 3 items with different servers to graph i cannot view the graph via monitoring --> graph. I see only a bitmap of a broken graphic. But when i use this graph in a screen i can see the graph. Is this a bug?

my items
bb01: Host uptime (in sec)
bb02: Host uptime (in sec)
bb03: Host uptime (in sec)

so if i add my other server(bb04) i see an broken bitmap.

thnx.

[Alexei]

This is probably due to low settings of parameter memory_limit in php.ini:

memory_limit = 128M

[Tristan]

thnx.. your solution worked!

I schould better read the manual next time!

thnx again.