Ok, but I upgraded from 1.5.6 to 1.6 and before the images were uploading fine....so, do you think it's a matter of php.ini configurations?
I installed your module and got this information:
max_execution_time 300
max_file_uploads 20
max_input_nesting_level 64
max_input_time 300
max_input_vars 10000
memory_limit 128M