My simple sql update query is not working right :( - sql

Question

I've got a simple sql query that is trying to update a single row. The code came from some Linq-to-sql code (i used Profiler to grab it), but please don't worry about the source (L2S) ... that's irrelivant to the question.
Now, when i try and do an update with the where clause, I get 0 rows updated.
I then try and do a select with the same where clause. i get a single result back. Ok, so the data is there.
It's only when i turn off some of the where clause statements does the query finally work. I just don't get it :(
I can't really explain it. So I made a video showing this.
Please watch the video on YouTube here.
Can anyone help? It's really weird :(
Database is MS-SQL 2008.
-- UPDATE
The sql i'm trying to execute (after i've cleaned it up from L2S)..
update tblBoardPost
set IsSticky = 1
where IdBoardPost = 1278
and IdAddress = 212787
and Subject = N'ttreterte'
and Banner is null
and UniqueSubject = N'ttreterte5'
AND (NOT ([IsAnnouncement] = 1))
AND (NOT ([IsSticky] = 1))
AND (NOT ([IsLocked] = 1))
and IsVisible = 1
and IdUserModified = 1
AND [IdNewsArticle] IS NULL
AND [IdList] IS NULL
(note: yes, i know the NOT (blah = 1)) is weird, but that's L2S that made that.
Update 2:
The code in the video is being ran in a transaction/rollback trans. this means that if i do run one of those weird scenario's that works, the change works .. but the rollback undoes it .. so when i run it a 2nd time .. the original value has been returned to the db row.
Also, in the vid, the select query is not exactly the same as the update query .. because i've been trying so many permutations (with no luck) .. so by the time i made the vid .. i forgot to show the original code. That said, the same code in both the select statement and the update/where statement (when i copy/paste on my machine) reproduces the exact same probs :(
Update 2 :)
As per Lieven's request, here's the screenshot showing the code and then the results.
alt text http://img196.imageshack.us/img196/7111/lieven.png

Answer 1

I checked your video, and you should try the same SQL conditions, that you used to return one row in your select query, in your update query. The conditions in the two SQL statements in your video aren't the same, and I don't really care why; they're not apples to apples.
Just copy and paste the working WHERE clause over the non-working one.

Answer 2

In the video, your select goes like
and not IsAnnouncement = 1
wich gives entirely different results as in your update
and not (IsAnnouncement = 1)
It seems you are suffering from an operator precedence issue .
Edit
as the queries don't match in your video and although you say they have matched could you copy paste following script and let us know if or if they do not give you the same results? (I for one would have a hard time believing that the rows affected would differ)
begin tran
select *
from tblBoardPost
where
IdBoardPost = 1278
and IdAddress = 212787
and Subject = N'ttreterte'
and Banner is null
and UniqueSubject = N'ttreterte5'
AND (NOT ([IsAnnouncement] = 1))
AND (NOT ([IsSticky] = 1))
AND (NOT ([IsLocked] = 1))
and IsVisible = 1
and IdUserModified = 1
AND [IdNewsArticle] IS NULL
AND [IdList] IS NULL
update tblBoardPost
set IsSticky = 1
where
IdBoardPost = 1278
and IdAddress = 212787
and Subject = N'ttreterte'
and Banner is null
and UniqueSubject = N'ttreterte5'
AND (NOT ([IsAnnouncement] = 1))
AND (NOT ([IsSticky] = 1))
AND (NOT ([IsLocked] = 1))
and IsVisible = 1
and IdUserModified = 1
AND [IdNewsArticle] IS NULL
AND [IdList] IS NULL
rollback tran