path problems on upgrading...

I had 4.5.2 installed previously with my images residing in root/gallery/ folder. A one-line sql-dump of image table shows this:

INSERT INTO `image` (`nid`, `image_path`, `thumb_path`, `preview_path`, `image_list`, `format`, `width`, `height`, `filesize`, `iptc`, `exif`, `personal`, `weight`) VALUES (1107,'./gallery/originals/c7b3c00a17622f7525cc8cebf571b7ef-1107.jpg','./gallery/thumbz/thumb_c7b3c00a17622f7525cc8cebf571b7ef-1107.jpg','','a:4:{s:6:\"90x120\";a:1:{s:5:\"fname\";s:68:\"./gallery/originals/c7b3c00a17622f7525cc8cebf571b7ef-1107_90x120.jpg\";}s:7:\"300x400\";a:1:{s:5:\"fname\";s:69:\"./gallery/originals/c7b3c00a17622f7525cc8cebf571b7ef-1107_300x400.jpg\";}s:7:\"800x600\";a:1:{s:5:\"fname\";s:69:\"./gallery/originals/c7b3c00a17622f7525cc8cebf571b7ef-1107_800x600.jpg\";}s:9:\"1280x1024\";a:1:{s:5:\"fname\";s:71:\"./gallery/originals/c7b3c00a17622f7525cc8cebf571b7ef-1107_1280x1024.jpg\";}}','jpeg',706,1024,59117,'N;','N;',0,0);

As I tried to run the update-image tool of 4.6.0 (after installing 4.6.0 of course) I couldn't get the images show up on my galleries anymore. I have tried to point images settings to the gallery folder or moved the galleries into files/ or into files/galllery/ but both with no luck. The gallery hierarchy can be seen with all nestings and information trough the web, but it can not load the images or resized versions of them at all. The update tool generates 0-byte files in files/ folder, same as my image node-numbers. Can someone please help me on this? I run an artists website covering many images (1300+ for now) and daily I got mails, why I removed the images, which results in loss of visitors.

I can also give my ftp info to someone, who can really fix this online (of course I have backed up the entire domain, in case that should with a loss of data)...