Whenever I install a new module I get my SQL server and IIS box into a bad series of events. On the SQL trace I can see this being run over and over again: 

exec dbo.GetTabPermissionsByPortal @PortalID=0

I can see this:

exec dbo.GetSchedule @Server='DOTNETNUKE'

I can see this:

exec dbo.ifty_GetTabsAndRedirects @portalId=0,@includeAdminPages=1,@includeHostPages=1

I can see this:

exec dbo.GetTabPermissionsByTabID @TabID=34,@PermissionID=-1

The fix is to restart IIS.

Can anyone help me understand why I can see these statements running thousands of times - same thing over and over again? I am running DNN version: 5.05.01(22)

There are also strange things happening with my install when I try to move modules using the Module Setting - Move menu. The module will not move.... the page reloads but the module is still there.

Sometimes I will delete a module and it will stay after reload... then a refresh takes is away... then a refresh will bring it back- ARHHH - please help.

Thank you

Problem was that there was more than one thread configured in the App pool. Changing this back to one thread seems to have resolved the issue - and a series of others too.