OS X Lion DMG and Java Issues

Question

I have a serious issue with my Lion installation.  In the process of upgrading from Snow Leopard through 10.7 to 10.7.1 to 10.7.2 somewhere in there, Java got badly broken.  I tried re-downloading Java for Lion and reinstalling but it gives me an idiot message that my OS version is not compatible.  ***?
So I open the package with Pacifist and do an install to default location from the top of the package and all the Java stuff works again.  But then within about three days I can no longer open DMG files.  I double click them and nothing happens.  Disk utility won't launch.  If I reinstall the 10.7. combo update, Disk Utility works and DMG files open but if I try to connect to a streaming Java service such as used by Go To Webinar, I never get anywhere.  So I am at the point where I can either work with DMG files OR I can use Go To Webinar but not both.
This is idiotic to me, but I cannot even begin to figure out why Java gets broken by applying an update and why my ability to work with DMG files keeps going away and if the two are actually related or there is just some weird timing juxtaposition. 
Anyone who has seen this problem and figured out a solution, please wade in.
Thanks!
Ross

Answer 1

JadedEye wrote:
If I reinstall the 10.7. combo update, Disk Utility works and DMG files open but if I try to connect to a streaming Java service such as used by Go To Webinar, I never get anywhere. 
Well, the issue doesn't seem to be in your User since the Combo Update doesn't touch anything in your User Account. This being the case and assuming you have a backup of your account on another disk, I'd do a clean install of Lion. Then in Setup Assistant migrate over all your stuff.