Treebrowser plugin works incorrectly, if in project settings has relative path. Problem in treebrowser/src/treebrowser.c file. The problem appears when use (pseudocode): GeanyProject *project = geany->app->project; dir = project->base_path ; and not checked the path type - absolute or relative base_path. The correct realization in the file geany-plugins/projectorganizer/src/prjorg-utils.c (function gchar *get_project_base_path(void)). 
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