TWO DIFFR EBS USER AT SAME TIME

Whenever we login with two different EBS users at the same time in the same machine,for the second user everything is working fine,but for the first user if we select any responsibility it showing the error message :

Two Method 

1.running on two different explorer.

2. Below the steps.

Errors and resolution in OAF

You have insufficient privileges for the current operation. Please contact your System Administrator.


You cannot run a page which is not SelfSecured when the MAC fails.



Solution:
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Set the profiles of the below three to 'None'


FND Validation Level
FND Function Validation Level
Framework Validation Level



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Error:
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when I am running, the fwktutorial.jsp, i am getting the links for hello world, etc. However when i click on the links, i am getting the follwoing error;

error:

Unexpected URL parameters have been detected and will be ignored. 



Solution:
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Go to Tools-->Embedded OC4J Preferences-->Global-->Startup-->Select Default Local IP Address.