[PG Theme] almost no icons

After upgrading to Gallery 2.1 and PG theme 1.1 RC1, almost no images from the theme are being displayed. No icons, action buttons, navigation overlays, or even the theme footer button - there's text instead (e.g. "firstprevious", "nextlast"). Looks like the path information for those images is lost. The only exceptions seem to be logo.gif, logoon.gif, and loading.gif...
This happens with and without use of colorpacks, and without any local files (ecept for author.tpl).

Where to look for the solution?
TIA
geewee

Gallery-Version = 2.1 Kern 1.1.0
PHP-Version = 4.4.1 cgi
Webserver = Apache/df-exts 1.2 (Unix) mod_ssl/2.8.22 OpenSSL/0.9.7d AuthPG/1.3 FrontPage/5.0.2.2635
Datenbank = mysqlt 3.23.58-log, lock.system=flock
Werkzeuge = ArchiveUpload, ImageMagick, Thumbnail, SquareThumb, Exif, Getid3
Beschleunigung = none, none
Betriebssystem = Linux 2.4.29-grsec #10 SMP Mon Jul 4 14:26:46 CEST 2005 i686
Standard-Motiv = PGtheme
Sprache = de_DE
Browser = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.2) Gecko/20060308 Firefox/1.5.0.2