Can't connect to SeptCTP x64

I've built and deployed cubes on a x64 server, with x64 SQL2005 SeptCTP.

Works pretty much fine. I can run 32 bit Excel on the server, and browse the cubes no problem.

However, if I fire up 32 bit Excel on my 32 bit client machine, and go through the MultiDimensional data source wizard to connet to the cubes, after I put the server name in, it throws this error:

"The peer prematurely closed the connection"

Then this error:

"An error was encountered in the transport layer"

Like a fool, I went from 32 bit to 64 bit and from JunCTP to SeptCTP at the same time, so I don't know which is to blame.

I'm aware of the classic "re-register msolap90.dll on the client" fix, and I've tried it, and it aint that.

Any ideas?

Some more info on this:

If I open up SeptCTP Management Studio on a 32 bit client machine, connect to the Analysis Server on the 64 bit server, it connects. I can see the database on teh x64 machine, and below that, I can see the Data Source, DSVs, Cubes etc.

BUT

When I right click on cube, and try to browse, it fails with the following error:

Cannot show requested dialog.

ADDITIONAL INFORMATION:

Deserialization failed: The 'EditionID' element in the 'http://schemas.microsoft.com/analysisservices/2003/engine' namespace is unexpected. (Microsoft.AnalysisServices)

Exactly the same error presents whether I try to get the properties of a cub, data source, dsv, whatever.

I do not understand this at all.

|||I got the same error on deploying my project. It works fine on Jun CTP but got the error in Sep CTP and the MSSQL 2005 evaluation copy. Any advise? Thanks in advance!