JPEG Viewer Problem...

Hey, I'm running firmware v1.50 o my PSP, and am having sporadic problems with JView. For some reason, It fails to see some folders which have my jpgs located in them. There is one or two folders whcih work fine, and are always shown on the file locator, but it is always the folder with my manga that fails to appear for me to enter into. It happened before, but eventually, it showed me the file again.

This time, I've tried more than 10 times loading, chaning the filenames, placing seperate images in other folders, but no, it never works :(

also, when I did get it to work before, sometimes one or two of the images would come up as a black screen, with some asian text on it... It would dissapear into the real image after I clicked on the settings button, but it was just kinda annoying.