My BOINC score statistics graph looks weird like this:

https://public.bay.livefilestore.com/y1plSOTMn8sZgd7UByY5KlO3ZxxBGgnxmPFWeQ43bYrxk_yqqiEyFO1Y17jJgUWnTEnYtZtCSAXOVV0yRMa-l7i4w/1.jpg?psid=1

And the text in the last line says "Last updated: -270 days ago".
How does this happen? Is there any way I can fix this?
Running 6.12.34 (x86).

How does this happen?

At some point your computer's time and date must've been changed to 270 days ago, at that time you had BOINC contact the Seti project.

Is there any way I can fix this?

Exit BOINC completely (File->Exit->check Stop running of science applications on Manager exit?"->OK).

Navigate to your BOINC Data directory. Default positions for it are in this FAQ, including showing you how to get to it when it's hidden.

Open the statistics_setiathome.berkeley.edu.xml file with Notepad. In it it'll probably show something like:

<project_statistics>
<master_url>http://setiathome.berkeley.edu/</master_url>
<daily_statistics>
<day>1323129600.000000</day>
<user_total_credit>312292.010586</user_total_credit>
<user_expavg_credit>190.310669</user_expavg_credit>
<host_total_credit>19759.890708</host_total_credit>
<host_expavg_credit>190.310710</host_expavg_credit>
</daily_statistics>
<daily_statistics>
<day>1323216000.000000</day>
<user_total_credit>312292.010586</user_total_credit>
<user_expavg_credit>108.281159</user_expavg_credit>
<host_total_credit>19759.890708</host_total_credit>
<host_expavg_credit>108.276576</host_expavg_credit>
</daily_statistics>
<daily_statistics>
<day>1323302400.000000</day>
<user_total_credit>312342.958816</user_total_credit>
<user_expavg_credit>107.669278</user_expavg_credit>
<host_total_credit>19810.838938</host_total_credit>
<host_expavg_credit>107.669351</host_expavg_credit>
</daily_statistics>
<daily_statistics>
<day>1323388800.000000</day>
<user_total_credit>312789.246362</user_total_credit>
<user_expavg_credit>129.348569</user_expavg_credit>
<host_total_credit>20257.126484</host_total_credit>
<host_expavg_credit>129.348628</host_expavg_credit>
</daily_statistics>
<daily_statistics>
<day>1323475200.000000</day>
<user_total_credit>313022.047251</user_total_credit>
<user_expavg_credit>146.448038</user_expavg_credit>
<host_total_credit>20489.927373</host_total_credit>
<host_expavg_credit>146.448095</host_expavg_credit>
</daily_statistics>
<daily_statistics>
<day>1323561600.000000</day>
<user_total_credit>313470.564629</user_total_credit>
<user_expavg_credit>167.391733</user_expavg_credit>
<host_total_credit>20938.444751</host_total_credit>
<host_expavg_credit>167.391781</host_expavg_credit>
</daily_statistics>
<daily_statistics>
<day>1323648000.000000</day>
<user_total_credit>313609.383797</user_total_credit>
<user_expavg_credit>161.368279</user_expavg_credit>
<host_total_credit>21077.263919</host_total_credit>
<host_expavg_credit>161.368322</host_expavg_credit>
</daily_statistics>

...

<daily_statistics>
<day>1323734400.000000</day>
<user_total_credit>313785.969463</user_total_credit>
<user_expavg_credit>171.416646</user_expavg_credit>
<host_total_credit>21253.849585</host_total_credit>
<host_expavg_credit>171.416687</host_expavg_credit>
</daily_statistics>
<daily_statistics>
<day>1323280800.000000</day>
<user_total_credit>313785.969463</user_total_credit>
<user_expavg_credit>171.416646</user_expavg_credit>
<host_total_credit>21253.849585</host_total_credit>
<host_expavg_credit>171.416687</host_expavg_credit>
</daily_statistics>
<daily_statistics>
<day>1324252800.000000</day>
<user_total_credit>314464.699166</user_total_credit>
<user_expavg_credit>175.736022</user_expavg_credit>
<host_total_credit>21932.579288</host_total_credit>
<host_expavg_credit>175.736050</host_expavg_credit>
</daily_statistics>
</project_statistics>

Check the values for the <day>/<day> entries. The values should be increasing, but there'll be one towards the end that's 972000 seconds less than the next one. That whole of <daily_statistics></daily_statistics> is what you want to lose, delete. Then use File->Save to save the file and File->Exit to exit out of Notepad.

Now restart BOINC (Start->(All) Programs->BOINC->BOINC Manager.
Your statistics tab for Seti@Home should now be fixed.

---

My BOINC score statistics graph looks weird like this:

https://public.bay.livefilestore.com/y1plSOTMn8sZgd7UByY5KlO3ZxxBGgnxmPFWeQ43bYrxk_yqqiEyFO1Y17jJgUWnTEnYtZtCSAXOVV0yRMa-l7i4w/1.jpg?psid=1

And the text in the last line says "Last updated: -270 days ago".
How does this happen?

That happens if the system clock of your computer gets set to the future (sometime in 2012, I can't read the numbers in your picture) and back again.

Is there any way I can fix this?

Yes. First of all, check the system clock (date).

Then you can edit the file statistics_setiathome.berkeley.edu.xml in your BOINC data directory and delete all the <daily_statistics></daily_statistics> blocks with the wrong (future) date in the <day></day> block. Values larger than 1324425600.000000 (2011-12-21) are in the future (as of today).

Gruß,
Gundolf
[edit]Okay, Ageless explained it in greater detail (and some minutes earlier ;-)[/edit]

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Computer sind nicht alles im Leben. (Kleiner Scherz)

I edited the XML file and the problem is fixed. Thanks!