Problems with GoogleCode SVN

I use GoogleCode (http://code.google.com) for my little open source projects, and it usually works quite nicely.
I was just trying to set up one of my repositories in writable mode on a new computer, and "svn ci" (checkin) gave 500-Internal Server errors, which was not very helpful.
Eventually I realised that although I had done the "svn checkout" with a --username=", when I was doing the checking it was using my computer username, rather than my google one...so presumably the authentication failed.
I had to do "svn ci --username=", then it worked ok.   I don't know why!

SVN Keywords

I just realised that my townguide files are no longer automatically updating their SVN keywords to record the revision number of the files.
It turns out that this is because the keyword properties in svn is set by the client, not the repository, and worse still you can not apply keyword properties to directories - you have to do each file individually.
I got around this by using the find command to add keywords to all of the python files by doing:

find . -name \*.py -exec svn propset svn:keywords "LastChangedDate Rev Author" '{}' \; 

Of course for files that do not have keywords set you have to edit them to add $Rev$ etc. into the comments.