Hyper Cache Tribulant Newsletter Plugin

I am having an issue running the following plugins together:

– Hyper Cache
– Tribulant Newsletter Plugin
– Tribulant Contact form 7 extension

The issue is when a new page is being displayed that was not previously in the cache. The text is garbled, a full page of funny characters as shown below:

��=�r�8����}D���������)�Nfs��xc��n%)DBc���eM6�r�q?��^�^����(Y�e��f�, h4Ѝ�Fw���������O����|�Fj��˟_�y}�*V��k��^���`����oX�n����S^p�^���*#���z}:��Ӷ�������jbc�h�\K�Un���”������<���C�\�����/�W��0f�d�a�����G���@��p��<‘u �|/

After the page is refreshed it loads normally. I have isolated the issue to the Hyper Cache and Newsletter Plugin. We require the (paid) newsletter plugin and may have to find an alternative to Hyper Cache if a solution cannot be found.

I hope to have this resolved ASAP, any ideas?

http://wordpress.org/extend/plugins/hyper-cache/