I was experiencing this problem as well. After reading this, I went and tried toschedule an index using Firefox (3.5.5) and was successful. I also tried setting the browser mode to IE7 inside of IE8 using the F12 trick, but this yielded the same resu...
The only thing that stands out to me, is your SNMP trap has different information in it than the one I posted. I suspect either the SNMP trap created on the AMS is not exactly like the documentation or something else along the path is malforming the ...
Could you try the eicar test and see what type of event (if any) is logged in MARS? Perhaps the test message generated by the AMS console is just not classified in MARS.
