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If I understand you correctly when you go to the module admin, no new modules are in the list at the bottom, waiting to be installed.
I have seen a similar problem a number of times. The cause is a waiting module which has not been placed correctly. I.e. you put something in modules which is not a module. Alternatively I have also had the same problem with the Frameworks directory being out of sync with the modules waiting to be installed. I'm a bit suspicious of this Frameworks thing as there seems to be multiple conflicting versions running around and I've had to switch different versions in and out to get various modules working. Very poor.