The crash occurs if you want to remove a file format that is used by a converter. Xforms doesn't allow that (and posts an error).
This patch does the same for qt2. It's not super ui, but I think silently removing the file format and the converters is no option either. The same has to go into qt4/ (I'll do that). OK for branch and head? Jürgen
Index: src/frontends/qt2/QPrefsDialog.C =================================================================== --- src/frontends/qt2/QPrefsDialog.C (Revision 13509) +++ src/frontends/qt2/QPrefsDialog.C (Arbeitskopie) @@ -19,6 +19,8 @@ #include "qcoloritem.h" #include "qfontexample.h" +#include "frontends/Alert.h" + #include "ui/QPrefAsciiModule.h" #include "ui/QPrefDateModule.h" #include "ui/QPrefKeyboardModule.h" @@ -845,7 +847,14 @@ void QPrefsDialog::remove_format() int const nr(fileformatsModule->formatsLB->currentItem()); if (nr < 0) return; - form_->formats().erase(form_->formats().get(nr).name()); + string const current_text = form_->formats().get(nr).name(); + if (form_->converters().formatIsUsed(current_text)) { + Alert::error(_("Format in use"), + _("Cannot remove a Format used by a Converter. " + "Remove the converter first.")); + return; + } + form_->formats().erase(current_text); updateFormats(); form_->converters().update(form_->formats());