I have a client that I have set up Plogger for who just wants to have a simple gallery. While he is uploading images suddenly that album will disappear on the front end, and when going into the admin area, the album is listed but when clicking on it all I get is a blank page. It also makes some of the other albums disappear on the front end, once I delete the "offending" album that isn't showing up in the back end, things seem to be back to normal.
Would file names break plogger? Would large file sizes break it?
Has there been any change to the server (i.e. changing PHP versions, removing safe_mode, etc.) or are these images from a different camera than usual? It sounds like either the image being uploaded times out or is being corrupted while creating thumbnails. This would cause the script to stop at that image (and any albums or images after the offending image would not be displayed). Can you check with the webhost to see if anything has changed with the server setup?