Changes to Derived Logical Column not reflected in Answers

Before I go off my rocker and stab myself with my IPhone lightsabre... :-)
I created a new logical column for an existing table in my BM, deriving from an existing column (a datetime field called ESTIMATEDCLOSE) as follows:
MONTHNAME(Sales.OPPORTUNITY.ESTIMATEDCLOSE) || ' - ' || CAST(Year(Sales.OPPORTUNITY.ESTIMATEDCLOSE) AS CHAR(4))
...which should give me something like "Jan - 2008". The problem is that it returned something like "2008/01/31 00:00:00" in Answers - completely unexpected.
I decided to start out small and try something simpler, changing my derived column to be only Sales.OPPORTUNITY.ESTIMATEDCLOSE. This returned "2008/01/31 00:00:00" in Answers - sort of expected.
Then I changed it to MONTHNAME(Sales.OPPORTUNITY.ESTIMATEDCLOSE). This also returned "2008/01/31 00:00:00" in Answer!!!
It almost seems as if a derived logical column is cached in some weird way and changes to the formula is not reflecting in answers. Thinking that something so simple must work and I made a simple mistake somewhere I have spend a good part of the past day playing around with this and trying every possible solution I can think of - no luck. The odd thing is that I would rename my logical column and this will be reflected in Answers, but changes to the derived expression is not reflected.
- I deleted the column and started all over - no luck
- tried creating derived columns using different datetime expressions or even just concatenating strings to each other - no luck.
- Restarted all the Oracle services, thinking it's a cach'ing issue - no luck.
- I rebooted the server - no luck.
Once, when I started out with only MONTHNAME(Sales.OPPORTUNITY.ESTIMATEDCLOSE) I got back correct values in Answers (Jan, Feb, Mar..) and I thought the problem was finally gone. So I added || ' - ' || CAST(Year(Sales.OPPORTUNITY.ESTIMATEDCLOSE) AS CHAR(4)) to the derived formula. Guess what, Answers kept on giving me back only the Month names, completely ignoring my updated formula.
Anybody else ran into this problem? Something so simple should surely work...

John,
Yes, cleared the cache (from Dashboard Administration) and also used nqcmd Call SAPurgeAllCache. Restarted BI Server. Still no luck.
I tried your formula and then only got back "2008/01/31" (just the date without the timestamp) - very strange.
Then I noticed the following amazing thing (by accident):
I started with a request in Answers that does not contain my derived column and then add my derived column to the report. The text would be all wrong in this column (Jan, Feb, March). Then I add the same column again to the report and the second added column will magically show the correct strings (Jan - 2008) !!! Even stranger is that the moment I added the same column again to the report, the text on the first column would also magically jump to the correct values (Jan - 2008).
I did a bit more testing and created a blank request and added my derived column as the only column - this time it will show the correct values immediately. It does seem like it's tied to the content already in the request. I went a step further and saved my buggy request and added it to a Dashboard - it worked perfectly in the Dashboard.
Must be something buggy here in Answers when working with derived columns. I'm on 10.1.3.4...

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