Slow and interrupted upload in FileZilla client 3.6 and 3.6.0.1 on Mac 10.8.2

[Freddy Hurkmans]

I tried both FileZilla 3.6 and 3.6.0.1 on a 2010 MacBookPro running OSX 10.8.2 using various network connections and user accounts. Uploads to a normally very stable and quick server (in local network) were very slow and connection was very instable.
After 4 hours of trying, with multiple retries inbetween I transferred a few hundreds of kilobytes.
After downgrading to version 3.5.3 the upload speed went back to a normal 10-15 MB/s.