Have the same problem too,
everything was working on Intranet setup for several months, then stopped showing ajax tree view from 3 days ago.
have already tried:
replace wpfb-load.php
if(SUPPRESS_LOADING_OUTPUT)
@ob_end_clean();
with
if(SUPPRESS_LOADING_OUTPUT) {
while(@ob_end_clean()){} // destroy all ob buffers
}
no effect
files and links can be opened, but folder tree views jsut show spinning circle