#7 spikegeneratorgroup not always spiking

[Anonymous]

Very simple Brian network taken from one of the example scripts. I recreate the network and run it 5 times and ask how many total spikes fire (supposed to be always 4). The output is the following:

sherbond@macbook-pro ~/src/brian/20091201_pres$ ./check_spiking.py
Counted 4 spikes.
Counted 4 spikes.
Counted 4 spikes.
Counted 0 spikes.
Counted 4 spikes.

Sometimes the spike generator doesn't fire even though I load the exact same spike times.

I am using:
Brian 1.1.3
Python 2.5
MacOS X

File included.

[Nobody/Anonymous]