[SOLVED] 2.0.3.1 Error messages in system controller

I attempted to select my system settings tab in the dashboard and all I get is a white screen. Checking the logs, I get the following error messages:

PHP notice: unserialize():Error at offset 0 of 18698 bytes in shop/system/library/user.php on line 24
PHP notice: unserialize():Error at offset 0 of 18698 bytes in shop/system/library/user.php on line 49

Line 24 is:
$permissions = unserialize($user_group_query->row['permission']);

and Line 49 is:
$permissions = unserialize($user_group_query->row['permission']);

I suspect that this has something to do with the fact that I had to do a repair on my permissions in the database because I had accidentally downgraded myself (top administrator) to demonstration yesterday. I used a repair from the forum and it got me back in. However, I can't get into the system settings now to get out of maintenance mode

Are there any ideas on how I can fix this? TIA!

UPDATE: Fixed by offsite help.

BUMP im having the same issue, how did you fix?