New answers tagged upgrade
You can have problems only if database schema changed from older to new version. To know if the your is the case, you can compare the file wp-admin/includes/schema.php for both the versions, see that online here for 3.8.1 and here for 3.5.1. Note that a db index change should not beak the site, but it can cause performance issues. If you think the schemas ...
I would make a backup and put it on a dev URL and test it to latest version. What plugins are being used?
Top 50 recent answers are included