RD Web Access: Unclosed CDATA section

Hi I've been having a problem presenting the WebAccess server via the F5.

 

I've followed the standard guide http://www.f5.com/pdf/deployment-guides/f5-microsoft-remote-desktop-services-dg.pdf and I am getting the following error in the browser flash up

 

XML Parsing Error:unclosed CDATA section

 

Location:https://FQDN/RDWeb/Pages/en-US/Default.aspx

 

Line Number284, Colunm 1170

 

Also in the LTM logs I get the following

 

http_process_state_prepend - Invalid action EV_INGRESS_DATA during ST_HTTP_PREPEND_HEADERS (Server side: vip=RDS-WebAccess profile=http pool=RDS-WA)

 

It works if I remove HTTP Profile and no Cookie Persistence but I am going to need that since it's a HTTPS site although I could use just one Web Access server but I'd like the option.

 

Hosted Platform is

 

IIS 8

 

Windows 2012

 

Has anyone else experienced this?