[rrd-users] fetch problem

I have a problem while fetching data from rrd
I made system to collect measures results in rrd database. My rrd file
definition is:

rrdtool create test.rrd
--step 600
DS:measure::GAUGE:600:0:100
RRA:AVERAGE:0.5:1:115200 // 5 min collection
RRA:AVERAGE:0.5:12:9600 // 1 hour collection
RRA:AVERAGE:0.5:288:400

The problem is when i want fetch 1 hour data and last values are nan,
for example:
fetch test.rrd AVERAGE -r 3600 -e 1110276000 -s 1110189600
returns:
timestamp measure

1110189600: 1.0000000000e+02
1110193200: 1.0000000000e+02
1110196800: 1.0000000000e+02
1110200400: 1.0000000000e+02
1110204000: 1.0000000000e+02
1110207600: 1.0000000000e+02
1110211200: 1.0000000000e+02
1110214800: 1.8611111111e+01
1110218400: 1.0000000000e+02
1110222000: 1.0000000000e+02
1110225600: 1.0000000000e+02
1110229200: 1.0000000000e+02
1110232800: 1.0000000000e+02
1110236400: 1.0000000000e+02
1110240000: 1.0000000000e+02
1110243600: 1.0000000000e+02
1110247200: 1.0000000000e+02
1110250800: 1.0000000000e+02
1110254400: 1.0000000000e+02
1110258000: 1.0000000000e+02
1110261600: nan
1110265200: nan
1110268800: nan
1110272400: nan
1110276000: 1.0000000000e+02

and this example is ok

but if the server was shutdowned at 1110277200 time, and it didn't work
fetch with new "start", "end" parameters doesn't work correctly. Have a
look below:
fetch test.rrd AVERAGE -r 3600 -e 1110280000 -s 1110193600
and results:

timestamp measure

1110193500: 1.0000000000e+02
1110193800: 1.0000000000e+02
1110194100: 1.0000000000e+02
1110194400: 1.0000000000e+02
1110194700: 1.0000000000e+02
1110195000: 1.0000000000e+02
1110195300: 1.0000000000e+02
1110195600: 1.0000000000e+02
1110195900: 1.0000000000e+02
..
..
..
..
1110273600: nan
1110273900: nan
1110274200: nan
1110274500: 1.0000000000e+02
1110274800: 1.0000000000e+02
1110275100: 1.0000000000e+02
1110275400: 1.0000000000e+02
1110275700: 1.0000000000e+02
1110276000: 1.0000000000e+02
1110276300: 1.0000000000e+02
1110276600: 1.0000000000e+02
1110276900: 1.0000000000e+02
1110277200: nan
1110277500: nan
1110277800: nan
1110278100: nan
1110278400: nan
1110278700: nan
1110279000: nan
1110279300: nan
1110279600: nan
1110279900: nan
1110280200: nan

Why rrd autmaticly changing resolution from 3600 to 300 ? It is always
when in rrd are nan values at last times.
Is it possible to force fetching with 3600 resolution?
Im using rrdtool 1.0.49



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