First subplot is blank

Hello,

I am trying to display two different subplots. However, although I get two browser pages the first is completely blank.

Here is a simple reproduction.

from plotly.offline import plot
from plotly.subplots import make_subplots

fig1=make_subplots(2, 1, subplot_titles=(1,2,3))
plot(fig1)
fig2=make_subplots(2, 2, subplot_titles=(1,2,3,4))
plot(fig2)

Is there a reason why you can’t have two?