My wordpress installation was fine.. then i saw this "upgrade the wordpress installation to 3.0.1" so i click and select upgrade automatically.. then after upgrade, the site still accessible on front end.. however when i try login at wp-admin, after login i will get page not found error. if i try wipe out my .htaccess to blank, i get 500 internal server error. Looking for solution to fix this, payment $20 usd Paypal msg me quick! my site was okay all the way till i select upgrade automatically, i thought it was a corrupted installation so i try to install a new copy of wordpress on the sub folder but still not working. I think its something to do with file permission probably
could be a plugin not compatible with 3.0.1 wp. disable all of them and re-enable one by to just to be sure
Update: only pm me if u know how to fix, don't pm me cause u think u can fix. prefer user with experience on it. i think could be related to permission with the folder wp-admin or sort.
If you are on shared hosing then it could be due to "PHP is running out of memory" Create a file named php.ini in directory /wp-admin/ and place following code: memory=20MB PHP: This should fix your problem. Good Luck.