Matt, The rule of thumb here is to either (a) make all GUI calls from the same thread or (b) explicitly synchronize each and every such call with a lock. In your case, on_search_button_clicked violates that principle.
If my understanding of the task at hand is correct, you are trying to initiate a thread with a button click. That thread, in turn, would initiate a database access. Once this completes, you want the string "Done" displayed in the GUI. Is that correct? If so, I suggest you take a look at Glib::Dispatcher http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/classGlib_1_1Dispatcher.html and use it to inform the GUI thread that the DB access is completed. One more thing. Are you sure on_search_button_clicked() and search_db() are the right place for the show_all call? Don't you want it to be a part of your initialization logic, i.e. immediately after you are done setting up your widgets in the beginning? Regards, Nickolai
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