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Both bugs are fixed now. Please test it.
Admin js files are loaded with the browse.php file and that is disabling browsers cache for those files. I don't know exactly what is the problem with modules.js, but if loaded directly (without using browse.php) it works.
The logout problem is related with $_SESSION, a change on 2.5.x (made for supporting jgrowl redirection) was the problem.
I hope it works ok for you now, thank you very much!