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I have a similar problem on 2.3.0 RC. The modules are actually there. They are just not showing up.
However, I found that I could still install them by manually typing the command. You get the basic command line off of any module that shows up for an install. Such as:
"your site"/modules/system/admin.php?fct=modulesadmin&op=install&module=article
Then change the module name to the name you know is there that you want to install.
Kind of awkward, but it works until I can figure out why the modules are not showing.
Nicholas James
President - LaDads
www.ladads.info