Just an update...
1) I have set target to CHOOSE(p_web.UserAgent='msie8','_self','_blank') but it still runs the report in another window if the browser is IE 8. I even tried replacing 'msie8' to 'msie 8' but get the same result.
2) Once the report runs, I get a blank window. But if I highlight the URL line and press enter, then the report displays in the window. This only happens on machines running XP and IE8. This report is being called from a button on a browse. On the General tab, the action is set to "Other" and on the Properties tab, I have set type to "Button" but have also tried it as a "Submit" button as well. Also, the "Include Row ID field" is checked and "Include Action" is unchecked.
3) I am only seeing this problem if I run the report from a browse.
I still would like the reports to run in their own tab or window using '_blank'.
Any suggestions to resolve this is greatly appreciated.