problem installing component on beta 15

[dotcom22]

Hi

I just install beta 15 without any problem... I try now to add some components from Install Manager but without success. I click on button for find my component and click on "Install" but nothing happen...

I try using "Install from Directory" method and no problem I can install components...

here what I try to do:

- I check about "tmp" permissions and 644 is set
- I check about the "tmp" path and all is ok...I have keep the default place..
- I unzip the component and zip again for see if is not a possible archive problem...but no change..
- Take a look into ACL but by default Super Admin can do anything... Anyway I set all settings to "Allowed" but no change..

here some other infos:

PHP Built On: Linux host.mysite.com 2.6.18-028stab070.5 #1 SMP Fri Sep 17 15:37:23 MSD 2010 i686
Database Version: 5.0.91-community
Database Collation: utf8_general_ci
PHP Version: 5.2.14
Web Server: Apache/2.2.16 (Unix) mod_ssl/2.2.16 OpenSSL/0.9.8e-fips-rhel5 DAV/2 mod_bwlimited/1.4
WebServer to PHP Interface: cgi
Joomla! Version: Joomla! 1.6.0 Beta15 [ Onward ] 29-Nov-2010 23:00 GMT
User Agent: Mozilla/5.0 (X11; U; Linux i686; fr; rv:1.9.2.12) Gecko/20101027 Ubuntu/10.04 (lucid) Firefox/3.6.12

Somebody know why this issue happen ??

thank