[eispice] Problem with eispice

Hello,
I'm new to eispice. It's a really cool software.
Now I was playing around with the Ibis-simulation and have a "strange" 
behaviour.
I have the cdcv304 Ibis model from TI.
I took the ispice-example from the homepage and modified it a little bit:

import eispice
ibs = eispice.Ibis("cdcv304.ibs")
cct = eispice.Circuit('IBIS Test')
cct.Vx = eispice.V('vs',0, 10, eispice.Pulse(0, 2.5, 
'0n','0.1n','0.1n','4n','8n'))
cct.Rt = eispice.R('vs', 'vi', 50)
cct.Tg = eispice.T('vi', 0, 'vo', 0, 50, '2n')
cct.Receiver = ibs['1']('vo')
cct.tran('0.01n', '18n')
eispice.plot(cct)

When I start this in the python console, eispice begins to simulate, but 
it always ends up with a crash after it consumed a ridiculous large 
amount of RAM and virtual memory. (So around 2GB). I played a little bit 
with the Rt value. When I change it to 50.000001 (or higher) or to 
49.99999(or lower) everything is fine.
Is this a problem only on my machine? Is this a problem only with my code?

Regards

Christian
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