I downloaded Qt 4.6.3 and tried to run QFtp example. After few minutes I've found strange problem: I can start downloading a file and if I click cancel on the progress dialog it disappears, but after that, whole file list seems to be "busy" or locked and I can't even change working directory. Disconnecting and connecting again doesn't work either.
The problem occurs only when I download files bigger than 10MB. I tried both VS2008 and MinGW4.4 versions of Qt4.6.3.