The GLBUBD tolerance controls how the global solver’s variable bound tolerance, GLBVBD, is applied.  There are three choices available 0:None, 1:All and 2:Selected. Selecting None removes the variable bounds entirely, and is not recommended.  The All setting applies the bound to all variables.  Finally, the Selected setting causes the global solver to apply the bound after an initial solver pass to find the first local solution.  The bound will only be applied to a variable if it does not cutoff the initial local solution.  LINGO defaults to the Selected setting.