Q:

Security Exception attempting to deploy a solution

 I must have upset SharePoint somehow as I can't use the Central Administration to deploy an installed solution.   Everything I do returns the wonderful '[SecurityException: Access denied.]'  error. 
I'm a domain administrator and a member of the local Administrators group.   In fact, I went thru every local group on this machine and added my user account.   Still no luck. 
I AM able to deploy the solution via the SharePoint Management Shell though. 
Any idea on how to fix the CA? 

A:

When you launch your browser, you need to Run as Administrator.