Recently, I have upgraded my f-secure antivirus software from version 8 to IS 2012. Since then all my files downloaded using jdownloader are corrupted. This is most visible while downloading archive files. Any archive file will produce ‘unexpected end of archive error’ during unpacking. I have downloaded number of [the same] files on two machines; one with f-secure IS 2012 and second with version 8.
All files downloaded on the computer running IS 2012 were corrupted, and in most cases I was unable to repair archive, even with recovery record present.
All files downloaded on the machine running old version of f-secure, were OK.
I have reported this problem to f-secure, but so far I didn’t get any intelligent resolution (surprise, surprise!). Unfortunately, they will stop support of the version 8 at end of the year, so I can’t just go back to the old version.
Any help/suggestion would be appreciated.
Thanks.

[editestowy]

Probably F-Secure has the option for scanning network traffic generated by jD (this option is responsible for most of the connection errors) or/and it is scanning all opened files (this may generate CRC errors).
So you'll have to add java.exe/javaw.exe into the Trusted list of your AV/FV and for these two running processes you'll have to add correct rules to switch of/disable html/web scanner.

@wojtek

Why do they call their virus 'secure' if it ruins your complete Internet experience?

After exchanging several emails with f-secure customer support and trying to follow silly to no end instructions, finally I have found perfect solution. I have ditched f-secure internet security 2012 and bought avg internet security 2012, and EVERYTHING is OK. So, if you want to use jdownloader stay away from f-secure.

[pspzockerscene]

Thanks for the feedback

GreeZ pspzockerscene