Subversion commit fails on cygwin (FSFS backend only)

Question

I'm trying to create a Subversion repository on Cygwin, but I'm unable to add any content. When I try to commit, I get the error "svn: E160004: Invalid changes line in rev-file". Here's my workflow:

1. Create a new repository

   svnadmin create ~/repo

2. Check out repository to working directory

   mkdir ~/working
svn co file:///home/username/repo ~/working

3. Add content to repository

   mkdir -p ~/working/myproject/trunk
cd ~/working
echo "Blah" > myproject/trunk/file.txt
svn add myproject
svn commit -m "Commit message"

The last step fails with the following message:

Adding         myproject
Adding         myproject/trunk
Adding         myproject/trunk/file.txt
Transmitting file data .svn: E160004: Commit failed (details follow):
svn: E160004: Invalid changes line in rev-file

I also tried a different workflow. I tried creating the working directory, adding content, then using svn import to add the content to the repository. But I get the same result.

The strange part is that if I create the repository using the BDB backend instead of FSFS, it works fine. I can add content without problems. I tried adding content to a BDB-backed repository, creating an FSFS-backed repository, and copying the data using svnadmin dump/load, but I get the same error when I try to add content to the FSFS-backed repository. I'd prefer to use FSFS if possible for interoperability purposes and ease of backup/restore.

I thought maybe the commit hooks were the problem. When I created the repository, I saw that all of the sample hooks were executable. I used chmod a-x to make the sample hooks non-executable, but that didn't fix the error. I'm not using any commit hooks.

I'm using Windows 7 Enterprise 64-bit. I'm using the 32-bit installation of Cygwin. I just updated Cygwin yesterday and installed Subversion, so the software is at the newest version.