Testing (attached) program starts, GtkEntry is focused,
user can input symbols but SCIM panel is hidden, it
floats up only if you re-focus it for (e.g. press Tab
twice) or move all the window
(/Panel/Gtk/ShowTrayIcon =
false, /Panel/Gtk/ToolBar/AlwaysShow = true).
Full description is in "[Scim-user] Showing
scim_panel_gtk on startup" mailing list thread.
entry.c, an example to recreate the problem
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user_id=13130
It should be fixed in new version.