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Ok, well, I figured out a way to fix this if anyone is still having problems. I noticed this happened to me when I stupidly entered 999999999999999 for the expiration...which can be perceived as a negative number...soo...if you have phpMyAdmin, this is a breeze to fix.
1. Open phpMyAdmin
2. Choose your database in the dropdown on the left
3. On the right-side find the category: xoops_config and click on the Browse button.
4. Under the heading conf_name, look for session_expire
5. Click on the Pencil to edit it.
6. Change the conf_value from 999999999999 to 45.
7. Make sure Save is selected as well as Go back to previous menu, in the bottom pull down menus and choose Go.
Your database will be updated, and the expiration time set back to 45. Now you can post and edit your preferences without getting the token expiration message.
I hope this helps someone out! (not bad for my third day with this software)