Finally, after more than 6 months
, I discover that my problems uploading files from browser to wordpress site and also on another php site are caused by avast. If I disable avast, uploading work ok, but with avast active the uploading start, upload some kb and then stop. After some minutes of timeout wordpress give me a http error. I usually use palemoon as my default browser. But I have same errors also with firefox. I have avast free (always updated) on win7x64.
Same help on this or someone that have same problems?
Thank you