Hi, At Tue, 13 Mar 2012 14:49:41 +0800, Du Yanning wrote: > org-mode 7.8.03 > emacs 23.3, 23.4, 24.0.94 > > steps to recreate: > > emacs -q > > copy the following code and paste it into the *scratch* buffer: > (add-to-list 'auto-mode-alist '("\\.txt\\'" . org-mode)) > (add-hook 'org-mode-hook '(lambda () (text-scale-set 4)))  > > M-x eval-buffer > > then C-x C-f to open a .txt file, and then C-x C-f to open another .txt file. > Every time a .txt is opened, the font size become larger and larger. > However, the indicator in the mode line remains +4. I can confirm this behaviour but I don't think this is an error. The description of `text-scale-set' reads: C-h f text-scale-set RET ,---- | text-scale-set is an interactive autoloaded Lisp function in | `face-remap.el'. | | (text-scale-set LEVEL) | | Set the scale factor of the default face in the current buffer to LEVEL. | If LEVEL is non-zero, `text-scale-mode' is enabled, otherwise it is disabled. | | LEVEL is a number of steps, with 0 representing the default size. | Each step scales the height of the default face by the variable | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | `text-scale-mode-step' (a negative number decreases the height by | the same amount). `---- The first time `org-mode-hook' is run the height of default font is scaled by 4 levels, i.e. the height of default font is set to a new value. The second time `org-mode-hook' is run the height is scaled again, this time based on the new value. And so on. If you want to set the face height you might use: (set-face-attribute 'default nil :height 100) Here `100' means 100% of the font size in pt (afaik). Best, -- David -- OpenPGP... 0x99ADB83B5A4478E6 Jabber.... dmjena@jabber.org Email..... dmaus@ictsoc.de