Blame doesn't work in some cases

Open repobrowser
From repobrowser open log dialog for some file or directory
Right click on some file from lower panel, select Blame..., click OK

->

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TortoiseSVN
---------------------------
'C:\Users\USERNA~1\AppData\Local\Temp' is not a working copy
---------------------------
OK
---------------------------

In other cases blame works fine:
  directly from repobrowser
  from log dialog when it is opened not from repobrowser.
  from explorer context menu

---
TortoiseSVN 1.8.1, Build 24570 - 64 Bit , 2013/07/22 18:28:29
Subversion 1.8.1, -release
apr 1.4.8
apr-util 1.5.2
serf 1.3.0
OpenSSL 1.0.1e 11 Feb 2013
zlib 1.2.8
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