Error when committing

Hello,

Here is an error that I get when trying to commit using TSVN 1.5.1 to
SVN 1.5.2:

Commit failed (details follow):
Server sent unexpected return value (400 Bad Request) in response to MKACTIVITY
request for '/svn/test/!svn/act/c33a5a27-c451-ef4c-8e21-62d5e4f5b2a2'

What is interesting, committing using command line 'svn commit ... '
command works.
 From another computer, TSVN 1.5.3 is able to commit.

-- 
Regards,
Ivan Cenov
OKTO-7 Co., Botevgrad, Bulgaria
i_cenov_at_botevgrad.com, imc_at_okto7.com
  GSM: +359 888 76 10 80
phone: +359 723 6 61 20, +359 723 6 61 61
  fax: +359 723 6 62 62