@bevyme
I have tried this previous, but it did not seem to make a difference.
@greg
I currently have WP Debug set to true, but it has until now not shown any error messages.
My error log file also shows now errors related to the wp adverts plugin and the category pages. I’ve contacted my host about it and will wait to hear back from them.
Does wp adverts require a version of PHP higher than 5.3? Is there any specific modules which need to be active?
I can provide an admin account if you would like to take a look at my install.