P.S.
I forgot to mention this at the start of this thread:
when i go to my sensor @tellmon.net, in column "Last update" sensors shows last updated status from few minutes ago.. but there is nothing on the graph :(

No new data, I even restarted my 24/7 server.
and there is still 01.01.1970 year (cannot select any date after that)..
No graph when press day, week, but when I press month tellmon shows some graph data ending with 26.02.2015

P.S.
I think it have something to do with 1970 year allways shown above graph...

Hi Pal,
tnx for quick reply.
I log almost every day, so thats not the case.
Still no graphs after 26.feb 2015...