Hi,
this is with yesterday's snapshot, but it's probably a little older than 
that. I think it's pretty severe, because it distorts data and is not 
always obvious.
To start with, run this code (in the GUI):
<hansl>
open denmark
smpl 1979:1 1985:4 # subsample
series dm = 400 * ldiff(LRM)
smpl --full
series xsd = normal()
series x = 0
smpl 1975:1 1985:4
plot dm
   options time-series
   option band=x,xsd,1.96
   option band-style=fill,dark-grey
   printf "set xrange [1975:1985]"
end plot --output=display
</hansl>
Then, edit the plot (right-click, edit). Increase the font size, click 
"OK", then "Apply".
What happens for me is that the data series (in this case the points on 
the one hand and the filled bands OTOH) become mismatched, at least one 
of them is shifted horizontally.
It seems --though I'm not sure-- that the missing values in one of the 
series are crucial to get this wrong behavior.
thanks,
sven