I installed Bitdefender Anti Plus 2015 on my PC about 2 months ago. Everything was OK.
Last week I was downloading a file in IDM. After several minutes I stopped downloading file, but I saw IDM still uses my bandwidth, while there was not any download in progress.
I uninstalled Bitdefender antivirus and I saw that IDM works Normally.
I tested Bitdefender 2016, but that is has problem like 2015 version.
Bitdefender has problem with Flashget and Firefox, too.