I have just uploaded my site from a local server to our our 1and1 host.
Everything seemed fine until I wanted to change a user profile. I went into 'Search Users' and instead of the expected list of users I got a white page with Search Users on the top left.

Our environment settings are:-

# concrete5 Version
5.6.1.2

# concrete5 Packages
Advanced Comments (3.0), Amiant Image Gallery (0.7.3), Basic Forum (1.0), Blog Thumbnail (1.0), Get Directions (1.0b), HTML5 Audio Player Basic (1.1.3), Html5 Music (1.0.3), Image Banner (0.9.3), Picture Zoom (1.1), Picture Zoom Adj (1.1), Restore Block Types (1.3), Sortable Responsive Gallery (1.5), Zoom Image (1.0.3), Zoom Image Dual (1.1).

# concrete5 Overrides
blocks/basic_test, blocks/content, blocks/guestbook, blocks/product_information, blocks/autonav, blocks/slideshow, libraries/languages, themes/epcb

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
5.2.17

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, ctype, curl, date, dba, dbase, dom, exif, filter, ftp, gd, gettext, hash, iconv, idn, imap, json, libxml, mbstring, mcrypt, mhash, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, posix, Reflection, session, shmop, SimpleXML, soap, SPL, SQLite, standard, tidy, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, zlib.

# PHP Settings
max_execution_time - 50000
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - -1
max_input_vars - 5000
memory_limit - 90M
post_max_size - 8M
safe_mode - Off
safe_mode_exec_dir - /usr/local/php/bin
safe_mode_gid - Off
safe_mode_include_dir - <i>no value</i>
sql.safe_mode - Off
upload_max_filesize - 40M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
pcre.backtrack_limit - 100000
pcre.recursion_limit - 100000
session.cache_limiter - nocache
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
safe_mode_allowed_env_vars - PHP_
safe_mode_protected_env_vars - LD_LIBRARY_PATH

We are using advanced permissions and other things seem to be working fine.

Any sugestions?