Here is one of my horror story of blog migration which happened after I migrated Shoutmeloud to Knownhost. Migration was perfect but somehow Super cache WordPress plugin did not like my breakup with previous host and so he started acting weird. When ever I click on clear cache my wordpress dashboard goes blank along with whole site. There is no error and no kind of warning. Its so hard to diagnose such problem when you don’t see any kind of error on your pages. In my case my website become invisible to me.
In my case fault was because of Super cache wordpress plugin but this wordpress blank problem issue can be because of many problem.
Since I was not aware of what the problem is, so I started rolling back things. Last thing which I did was cleaning the cache so I had to rollback the super cache plugin. I logged into my server FTP and deleted the super cache plugin but it didn’t worked. My 2 cents , when ever you feel problem is big, start form scratch. I opened wp-config file and to cross check if all the database information is intact or if there is any blank space in it.
In my wp-config file I can clearly see this code
define('WP_CACHE', true); //Added by WP-Cache Manager
Since I have already uninstalled the super cache plugin, I removed this line and re uploaded the file and everything worked fine. I installed the Super cache plugin and horror story started again. As soon as I enabled plugin, website went down again. I wish if I can share my emotions here. After spending lots of time (5 minutes ) on Google search and wordpress support forum, I realize I have to reinstall the plugin. That means uninstalling the plugin and reinstall the plugin again.
By uninstalling it means a complete removal of super cache plugin and removing every instance of it. I took the help of notes provided by super cache plugin on how to uninstall Super cache plugin . Followed the steps and reinstalled the plugin and every thing worked fine.
Probably change in directory path while migration disrupt Super cache plugin. I hope this guide will help any one who may get into such problem.