[problem]svn client always access root folder.

hi:

There is a strange problem when I update TortoiseSVN client to 1.5 and later.
Svn update/commit operations fail (show log ok):
>>>Server sent unexpected return value (403 Forbidden) in response to OPTIONS
>>>request for 'https://abc.com/svn-top'

The same folder works well at least in 1.4.3 TSVN.
i do not know which changes in 1.5 causes this.

Why svn try to access a svn-top folder when I update a deep folder????
This is not a TSVN problem, because Subversion cmd update fails the same.

OS and versions:
server:
  1.5.4 on apache
client (windows):
  TortoiseSVN 1.5.5, Build 14361 - 32 Bit , 2008/10/24 18:06:34
  Subversion 1.5.4,

top folder:
 https://abc.com/svn-top
problem folder:
 https://abc.com/svn-top/..../foo
one deep problem folder(update this folder cause same svn error):
 https://abc.com/svn-top/.../foo/a/b

folder b/ and folder a/ have no svn-prop options
folder foo/ have 2 svn-prop:
 svn:externals f1 https://abc.com/svn-top/.../xxx f2
https://abc.com/svn-top2/.../yyy
 svn:mergeinfo xxxxxx

After I removed mergeinfo prop, problem still exists.
I doubt that this problem comes from svn-prop externals, but not sure.
We use a lot externals folder under foo/ .

I checked in server, no strange errors but client trying to access top
folder and forbidden.

There is two way to solve this problem :(
1, back client version to TSVN 1.4.3
2, checkout again and again when then foo/ folder goes bad......

PS: Is there any way to open debug logs of Subversion or TSVN?
At lease let me know where and when the problem happens.

-- 
Yours Fanlix
http://www.fanlix.com
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