Can browse WebDAV, but cannot copy photos

Hi,

My gallery install is running fairly well; however, I have a nagging problem that's been bugging me since shortly after either the 2.2.2 or 2.2.3 release:

I can successfully see my WebDAV mount from Windows XP, meaning I can successfully log in and browse all the Gallery albums via Windows. However, whenever I try to copy files, I get an error message to the effect of:

I can avoid this by disabling HTTP authentication, but that's not so good...

Any suggestions?

Thanks!

BTW, I have enabled URL rewrite. It has "passed" its automatic testing (module enabled and .htaccess is writable.) I have the WebDAV rewrites enabled, and the WebDAV plugin reports a successful configuration. I don't know what else to troubleshoot.

Gallery version = 2.3 core 1.3.0
API = Core 7.54, Module 3.9, Theme 2.6, Embed 1.5
PHP version = 5.2.8-pl2-gentoo apache2handler
Webserver = Apache
Database = mysqli 5.0.70-log, lock.system=database
Toolkits = ArchiveUpload, Exif, Getid3, jpegtran, LinkItemToolkit, Thumbnail, Gd, Dcraw, Ffmpeg, NetPBM, ImageMagick
Acceleration = none, none
Operating system = Linux mebox 2.6.27-gentoo-r7 #3 SMP Fri Jan 16 11:00:38 CST 2009 x86_64
Default theme = matrix
gettext = enabled
Locale = en_US
Browser = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5 (.NET CLR 3.5.30729)
Rows in GalleryAccessMap table = 60020
Rows in GalleryAccessSubscriberMap table = 8631
Rows in GalleryUser table = 3
Rows in GalleryItem table = 8629
Rows in GalleryAlbumItem table = 96
Rows in GalleryCacheMap table = 0
WebDAV Client OS: WinXP SP3