Erratic Locking Behavior With TortoiseSVN

This problem occurs with:

TortoiseSVN-1.2.4.4479-svn-1.2.3.msi

TortoiseSVN-1.2.6.4786-svn-1.2.3.msi

TortoiseSVN-1.3.0.4947-dev-svn-1.3.0.msi - from the 11/14 nightly build

I've checked the issue tracker and the mail lists without finding any
matches.

I've run into some strange locking behavior with TortoiseSVN. Server:
Linux with Subversion 1.2.3 and Apache 2.0.54, Client: WinXP SP2. The
test files have the needs-lock property set. When locking a file with
TortoiseSVN, the icon shows the lock and the windows property changes
from read-only to "writable", but the file changes can't be saved -
error: "Access to .../file was denied". Cygwin shows the file is still
read-only. Doing the same lock/write/commit operations works properly
from the Cygwin command line. Changing the file to writable with Cygwin
and doing the rest with TortoiseSVN also works. This strange behavior
doesn't occur with a fresh working copy but only after an area has been
used for a while (sorry there is no better definition of when things go
bad).

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