another thought:

If it is a very old workunit, it will not receive any points when sent in, since there is a timeout limit for both computer time/run time and wall clock time.

Many slow computers take several days to run something before sending it in. There is no daily point penalty.

Obviously when I come to post about an problem I have (it's only my second problem with WCG), it's weird and was never reported before ) Ok thanks for your answers.

I got some informations concerning the exact problem of my two team-mates:
1- she began the work unit a few time before the week end on her laptop (like friday or thursday, but not 2 weeks before). The work unit was ended during the week-end, but since she hadn't internet, she waited till monday to be back at home. She got a new work unit, but didn't get any points (it happened twice to her) But according to her, it didn't take weeks to do the workunit.
2- My team-mate and I: We had a certain total of points. We didn't make run WCG for some days and the next time we've launched WCG, we had lost 2000 pts (obviously it happened twice to me since I think I had about 36000 pts and now I have 32000, it happenned once for him, he had about 5000 pts on wednesday evening, and then this morning he had only about 3000 pts).

So, even if finally there are two different problems, it seems that it's not due to the timeout limit.

I'll write to the professional staff to see what they think about that.

PS: Lewis Caroll, you absolutely understood what I meant

Ok I'll keep in touch with you through this topic to tell you what has been said to me and how it's worked.
Concerning the difference that can be seen between the Grid and WCG website, our team had worked on sort of huge FAQ (in french since it's a french team), so I'm okay with that, I know it by heart or almost

It's already Dec 31st here in France, so I wish you a happy New Year Eve

I noticed that my Windows agent (not boinc) does not show all my points. It is a significantly lower number - more than a day's worth now. Seems to be a percentage. Currently on this laptop it shows 1455281 and the webpage is showing 1947486.

So when you say you lost points, it may be what I also experience - online is pretty accurate except that BOINC agents need to be verified so they will not show up until later.