[PyQt] got stuck translating webftpclient example to PyQt

[Moritz Warning]

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I tried to translate the webftpclient example from the Qt examples to PyQt and got stuck.
The code is on github: https://github.com/mwarning/PyQt4-Examples

Currently, the window opens but nothing is displayed.
The HTML string to be displayed seems to be alright.

Here is the order of method calls for the cpp code:

FtpView.init
NetworkAccessManager.init
Downloader.init
NetworkAccessManager.createRequest
FtpReply.init
FtpReply.processCommand
FtpReply.processCommand
FtpReply.processListInfo
FtpReply.processListInfo
FtpReply.processListInfo
FtpReply.processListInfo
FtpReply.processListInfo
FtpReply.processCommand
FtpReply.setListContent
FtpReply.bytesAvailable: 920
FtpReply.isSequential
FtpReply.readData
FtpReply.bytesAvailable: 408
FtpReply.bytesAvailable: 408
FtpReply.updateWindowTitle
FtpReply.abort

.. and my malfunctioning PyQt code:

FtpView.init
NetworkAccessManager.init
Downloader.init
NetworkAccessManager.createRequest
FtpReply.init
FtpReply.processCommand
FtpReply.processCommand
FtpReply.processListInfo
FtpReply.processListInfo
FtpReply.processListInfo
FtpReply.processListInfo
FtpReply.processListInfo
FtpReply.processCommand
FtpReply.setListContent
FtpReply.bytesAvailable: 920
FtpReply.isSequential
FtpReply.bytesAvailable: 920
FtpReply.bytesAvailable: 920
FtpView.updateWindowTitle
FtpReply.abort

As you can see the behavior differs after isSequential is called.

Any ideas how I can debug this further?

regards,
mwarning
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