Hi Kolbo5. Sorry about your problems. It sounds like you set everything up correctly. Since you see the cbz files in the Library app, it means the extensions.cfg file was read correctly. pbimageviewer does have a log file that you can configure, but it is off by default. You can turn it on by hand by editing the file
/system/config/pbimageviewer.cfg and setting:
Log messages will then be written to
pbiv.log in the internal memory filesystem. The log file contains output that the program normally writes out. Unfortunately, if the program is crashing, the error message from that won't be written to the file. The only way to see it is to run the program within a terminal and see what the error message is. You can get a terminal by installing
pbterm and running it on the reader, or installing
utelnetd and using telnet to connect to the ereader from a PC. Let me know if you need anymore help.