First of all: I´m using Windows Vista 64 Bit
I'm sorry, but I encountered this problem only on Windows and your wiki page says it's impossible to obtain stack traces there

While I try to create an PIN/TAN account with AqBanking, more precisely, while I try to retrieve  the Server Certificate of my bank (BBBank Karlsruhe - BLZ: 66090800) following error occures:

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Microsoft Visual C++ Runtime Library
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Assertion failed Program: C:\Programme\gnucash\bin\qt3-wizard.exe
File: netlayer.c
Line: 579

Expression: nl

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.

(Press Retry to debug the application - JIT must be enabled)
####

When I press "Retry" Windows says: "qt3-wizard.exe encountered a problem and must be closed.

After I closed this message, gnucash says that Qt is not installed or the PATH-variable is wrong.
However Qt is installed and the PATH is correct. I also read in a GnuCash-Wiki that you should´nt install QT for this version of GnuCash (2.2.7) because GnuCash delivers it´s own QT-librarys.

So, I´m very confused, desperate and sad because GnuCash looks very good and I was very excited that it works unter Windows.
But without the support of HCBI it is useless for me.