I all, from some days private module in one of my sites dont' work. all can access all files in all nodes, but if i try to download privacy_test.txt from the download path 'system/files/private/privacy_test.txt' it redirect normally to the right page.
i've tried to change directory, reupload all files, change the files uploaded yet, but it seems to be broken...

any idea??

PS: please is very critical, the site is online!!