I got the problem solved! It turned out to be a directory access problem. I used texlive for math formular editing, and the access mod for directory that contains these executables is 777. After I changed it to 755, the problem disapeared. I overlooked a warning in my log, which says: 'world writable directory /xxx/xxx'. And I didn't expect this would cause such weird behavior, I don't see much connection here..
I wasted a lot of time on this and it really taught me a lesson! Thanks for all your kind help. You are a very nice man! --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---

