When one or more of your extensions are in conflict, they will not function as intended or will not function at all often producing just a blank page.
Once you have found out which extensions are conflicting you will need to change the conflicting file of one extension (lets call it A) to inherit from the other extension (lets call it B).
So originally where you may have had something like:
You would change it to:
Once you have done this you need to change extension B config.xml file commenting out the conflicting "<rewrite>" blocks that are now inheriting from A.
You will also need to identify any conflicting phtml files and merge the files into one phtml file incorporating all of the functionality of the multiple files. This means you will also have to edit any related layout xml files to point to the new merged phtml file.
We have developed a version of MDNs extension conflict tool which is compatible with PHP5.3 / Magento Enterprise 1.8.
Please find it attached.The original version of this extension is available here
We do offer a conflict resolution service which is charged at an hourly rate. It is not provided as a free service with any extension purchase.