Login with an ftp client.
Navigate to ../e107_plugins/custompages directory.
Right Click on the 'custompages' directory and then click on CHMOD. Change the number to 777 (read, write, execute).
try removing and reinstalling it, but you should use that as your last resort. unless you create a backup, you will lose your data. i lost my data cuz mySQL shut down. probably that is why you cant log in, the server might be confused.
i'm switched to e107, that looks easier to use, now (of course) i have 2 question: why can't i give my members ranks...?
where can i add links to the "links" page....? i thought i could do it on the page it self but apperantly not...