(This is happening in fact in v0.2.1 - missing the version in your bugzilla product)

In Ubuntu Edgy, with the package available in their repositories. I start recording, I press stop, the window to save the document opens a milisecond (or two ;) ) and then the application crashes. 

pinguinotv@pinguino:~$ istanbul

(((((((here I'm recording, the rest comes after pressing stop))))))

DEBUG: final pipeline: istximagesrc name=videosource ! video/x-raw-rgb,framerate=10/1 ! videorate ! ffmpegcolorspace ! videoscale method=1 ! video/x-raw-yuv,width=1024,height=768,framerate=10/1 ! theoraenc ! oggmux name=mux ! filesink location=/tmp/tmpqXddWg
SaveWindow with file: /tmp/tmpqXddWg
The program 'istanbul' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadAlloc (insufficient resources for operation)'.
  (Details: serial 45 error_code 11 request_code 141 minor_code 19)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
pinguinotv@pinguino:~$ 


BTW, BugBuddy doesn't show up after the crash and it should, isn't it?