My own install on shared hosting at Bluehost
/rc/installer: page 1 reports all is well. Click on Next and Page 2 is blank.
Seems as if this must be fairly common but I can't find a solution for it here or elsewhere.
Page 1 report:
QuoteChecking PHP version
Version: OK(PHP 5.2.17 detected)
Checking PHP extensions
The following modules/extensions are required to run Roundcube:
PCRE: OK
DOM: OK
Session: OK
XML: OK
JSON: OK
The next couple of extensions are optional and recommended to get the best performance:
FileInfo: NOT AVAILABLE(Could be loaded. Please add in php.ini; See http://www.php.net/manual/en/book.fileinfo.php)
Libiconv: OK
Multibyte: OK
OpenSSL: OK
Mcrypt: OK
Intl: NOT AVAILABLE(See http://www.php.net/manual/en/book.intl.php)
Exif: OK
Checking available databases
Check which of the supported extensions are installed. At least one of them is required.
MySQL: OK
MySQLi: OK
PostgreSQL: OK
SQLite (v2): OK
Check for required 3rd party libs
This also checks if the include path is set correctly.
PEAR: OK
MDB2: OK
Net_SMTP: OK
Net_IDNA2: OK
Mail_mime: OK
Checking php.ini/.htaccess settings
The following settings are required to run Roundcube:
file_uploads: OK
session.auto_start: OK
zend.ze1_compatibility_mode: OK
mbstring.func_overload: OK
suhosin.session.encrypt: OK
magic_quotes_runtime: OK
magic_quotes_sybase: OK
The following settings are optional and recommended:
date.timezone: OK
I haven't heard of this problem before, try re-uploading RoundCube to the server.