It is impossible to set/unset bit when result displayed (text is bold) in Programming mode)

Binary package hint: gcalctool

It's not comfortable to change bits in number, when after first set/unset bit text become bold, and not possible to change second bit.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gcalctool 6.0.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Thu Apr 14 17:49:07 2011
ExecutablePath: /usr/bin/gcalctool
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 LANGUAGE=ru_RU:en
 PATH=(custom, user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: gcalctool
UpgradeStatus: Upgraded to natty on 2011-03-25 (20 days ago)
XsessionErrors:
 (gnome-panel:1608): GConf-WARNING **: Directory `/apps/panel/toplevels/bottom_panel_screen1/screen' was not being monitored by GConfClient 0x8237da0
 (gnome-panel:1608): GConf-WARNING **: Directory `/apps/panel/toplevels/top_panel_screen1/screen' was not being monitored by GConfClient 0x8237da0
 (nautilus:1590): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (nautilus:1590): GStreamer-CRITICAL **: gst_debug_add_log_function: assertion `func != NULL' failed
 (process:10041): Gtk-WARNING **: Locale not supported by C library.