I have updated over 25 sites so far and for the most part – everything has gone smoothly. There were a handful of sites though that had issues with a few plugins (including this site) due to one common issue: jQuery. If you are seeing any strange behavior – post upgrade, the first thing you will want to do is to make sure all your plugins are up to date. After that – if you are still having problems – check to see if any of your plugins rely on jQuery. If they do – next check the code (either look at the js files in the plugins, or look at your site’s source code to see if it is loading an old version of jQuery). There is a good chance they are using an older version, or are relying on something that no longer works with the latest release of jQuery (1.3.2 as of today).
Some plugin developers are aware of the issues but have not released an updated plugin. Because you are most likely not alone with your issues – check out their support forums, or post comments to see if someone came up with a quick fix so you can be back in business.
While most WordPress updates can be performed quickly and easily by almost any user – there are times when you run into unexpected problems that can cost you dearly. When this happens – don’t hesitate to call us. We have been working through WordPress updates for years and can help out!