I have a report that when I add a simple
-OLAP ON it returns a 'error on page' in the bottom left corner of my Internet Explorer browser.

Does anyone know what could be causing this?

Here is a small excerpt from the 'view source' for the page, not sure if the 0 shown is consequential.
</HTML><!--
0 NUMBER OF RECORDS IN TABLE= 93158 LINES= 26684
0 HOLDING HTML FILE ON PC DISK ...

WebFOCUS Version 7.6.2 compiled and linked on Tue Jun 26 21:27:18 EDT 2007 (Gen branch762:130)
-->

what do you get when you double click on that warning message?

If you change your read/record limit to let's say 20000 does it work?