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    <p>I'm not sure if your function is really the cause of your problem. If it should be the case, the wrong usage of the <code>let*</code> that scottfrazer pointed out might be the cause. But you don't even need that <code>let*</code> (and <code>switch-to-buffer</code>) at all, because</p> <ol> <li>what you're trying to do is better done with Emacs' built in <code>save-excursion</code>, and</li> <li>you aren't actually switching the buffer ever.</li> </ol> <p>OTOH, you should have used <code>let</code> instead of the <code>setq</code>s in the lower half of your function, because <code>setq</code> will otherwise change a variable from an enclosing lexical scope. In this case you might very well have stomped over a <code>buffer</code> variable from the function that's executing the <code>desktop-save-hook</code> which is another potential cause of your problem.</p> <p>But you don't need those <code>let</code>s either because you can do the second loop with another <code>dolist</code>. You can get rid of those first 50 buffers that you don't want to loop over with <code>nthcdr</code>.</p> <p>Here's my improved version of <code>kill-old-buffers</code>:</p> <pre><code>(defun kill-old-buffers () "Kill buffers from end of buffer list (not used recently) until no more than 50 buffers are left. Remove temporary buffers first." (interactive) (save-excursion (dolist (buffer (buffer-list)) (if (or (string-match "^\*" (buffer-name buffer)) (string-match "\.hpp$" (buffer-name buffer))) (kill-buffer buffer))) (dolist (buffer (reverse (nthcdr 50 (buffer-list)))) (unless (eq buffer (current-buffer)) (kill-buffer buffer))))) </code></pre>
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    1. COThanks a lot. Lisp is not my primary programming language, as you already may have guessed ;-) I have replaced my version with yours, but only time will tell, if this ends my occasional problems. I will report, if this happened again in a week or two.
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    2. COJust a short update after three weeks of experience with your solution: It seems to work without problems now, though I still don't understand, what caused the original problems. Thanks a lot again.
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