Dubugging GCK2.5 under wine

The new window that fails to be displayed, contains (when run natievly under W2K) the following text (and radio buttons for the four different file types):

Select File Type
Contruct (Ctrl-C)
Illustration (Ctrl-I)
List (Ctrl-L)
Gel (Ctrl-G)
New File Name
OK
Cancel

The text associated with the different radio buttons appears first in the debug file in the following lines (as determined by the command "grep -n "List" all_output > List_output", etc):

3890577 Gel
3885836 Illustration
3881107 List
3876329 Construct

That is within the range where we predicted the error to be. Let's now look at what happend shortly before and after these commands were issued. After using GCK2.5 under wine a little bit more, I noticed that there is another function that causes the program to crash without error message, namely the "find sequence" function. Also in this case a dialog is displayed in which the user is supposed to type in a nucleotide sequence. Maybe there is something in common for these two crashes which could help to identify the crucial system call that makes the program to crash.