Does this also happen for very simple figures? For example, if you just run
figure(1)
close all
does it also take a long time?
Also, try opening the closereq function and making sure it looks like this:
function closereq
%CLOSEREQ Figure close request function.
% CLOSEREQ deletes the current figure window. By default, CLOSEREQ is
% the CloseRequestFcn for new figures.
% Copyright 1984-2012 The MathWorks, Inc.
% Note that closereq now honors the user's ShowHiddenHandles setting
% during figure deletion. This means that deletion listeners and
% DeleteFcns will now operate in an environment which is not guaranteed
% to show hidden handles.
if isempty(gcbf)
if length(dbstack) == 1
warning(message('MATLAB:closereq:ObsoleteUsage'));
end
close('force');
else
delete(gcbf);
end
