BuddyPress Member Profiles lost directory or .htaccess

Hi, I have a problem I cannot solve and it is preventing me finishing the site for a presentation

I am running WP 3.1.1 and Buddypress 1.2.8 on Bluehost.com

The web address is http://www.irrilium.com/SecretPlan

Up until last week the build was going well. Sunday I began to get problems with profiles. I can navigate to the members page but on selecting a member or avatar to go to their profile or, when selecting profile from the BP nav bar I got server error 500.
I tried various fixes including renewing the .htaccess file and refreshing Permalinks. This didn’t resolve the problem. When I contacted Bluehost they reported it was a error 400 problem and the directories the selected URL was looking for did not exist.
To cut a long story short I asked Bluehost to restore a previous version of the site which was functional.

However, I am now back to where I started from even though the backed–up site which was used as the restore had been functioning perfectly.

So I am lost and need your help.

This is the current state of the site

.htaccess

# Use PHP5 Single php.ini as default
AddHandler application/x-httpd-php5s .php

Error log from this a.m.

Sat Apr 30 03:14:39 2011] [error] [client 66.147.244.160] File does not exist: /usr/local/apache/htdocs/wp-app.php
[Sat Apr 30 03:14:44 2011] [warn] RewriteCond: NoCase option for non-regex pattern '-f' is not supported and will be ignored.
[Sat Apr 30 03:14:50 2011] [error] [client 95.108.246.253] Failed loading /usr/lib64/php/zend/ZendOptimizer-5.1.so: /usr/lib64/php/zend/ZendOptimizer-5.1.so: undefined symbol: zend_unmangle_property_name_ex
[Sat Apr 30 03:14:53 2011] [error] [client 66.249.68.245] PHP Warning: PHP Startup: Unable to load dynamic library './magickwand.so' - ./magickwand.so: cannot open shared object file: No such file or directory in Unknown on line 0
[Sat Apr 30 03:14:56 2011] [error] [client 66.249.68.53] PHP Warning: PHP Startup: Unable to load dynamic library './magickwand.so' - ./magickwand.so: cannot open shared object file: No such file or directory in Unknown on line 0
[Sat Apr 30 03:14:58 2011] [error] [client 66.249.68.245] PHP Warning: PHP Startup: Unable to load dynamic library './magickwand.so' - ./magickwand.so: cannot open shared object file: No such file or directory in Unknown on line 0
[Sat Apr 30 03:15:03 2011] [error] [client 66.249.67.52] PHP Warning: PHP Startup: Unable to load dynamic library './magickwand.so' - ./magickwand.so: cannot open shared object file: No such file or directory in Unknown on line 0
[Sat Apr 30 03:15:04 2011] [error] [client 99.23.248.81] Invalid method in request \x807\x01\x03\x01
[Sat Apr 30 03:15:04 2011] [error] [client 99.23.248.81] File does not exist: /usr/local/apache/htdocs/501.shtml
[Sat Apr 30 03:15:05 2011] [error] [client 99.23.248.81] Invalid method in request \x807\x01\x03\x01
[Sat Apr 30 03:15:05 2011] [error] [client 99.23.248.81] File does not exist: /usr/local/apache/htdocs/501.shtml
[Sat Apr 30 03:15:18 2011] [error] [client 99.23.248.81] Invalid method in request \x807\x01\x03\x01
[Sat Apr 30 03:15:18 2011] [error] [client 99.23.248.81] File does not exist: /usr/local/apache/htdocs/501.shtml
[Sat Apr 30 03:15:18 2011] [error] [client 99.23.248.81] Invalid method in request \x807\x01\x03\x01
[Sat Apr 30 03:15:18 2011] [error] [client 99.23.248.81] File does not exist: /usr/local/apache/htdocs/501.shtml
[Sat Apr 30 03:15:27 2011] [notice] cannot use a full URL in a 401 ErrorDocument directive --- ignoring!
[Sat Apr 30 03:15:29 2011] [notice] cannot use a full URL in a 401 ErrorDocument directive --- ignoring!
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20060613/ixedts.lin' - /usr/local/lib/php/extensions/no-debug-non-zts-20060613/ixedts.lin: undefined symbol: executor_globals_id in Unknown on line 0
[Sat Apr 30 03:15:35 2011] [error] [client 66.249.68.2] PHP Warning: PHP Startup: Unable to load dynamic library './magickwand.so' - ./magickwand.so: cannot open shared object file: No such file or directory in Unknown on line 0
[Sat Apr 30 03:15:45 2011] [error] [client 66.249.68.1] PHP Warning: PHP Startup: Unable to load dynamic library './magickwand.so' - ./magickwand.so: cannot open shared object file: No such file or directory in Unknown on line 0
[Sat Apr 30 03:15:50 2011] [error] [client 157.55.16.229] PHP Warning: PHP Startup: Unable to load dynamic library './magickwand.so' - ./magickwand.so: cannot open shared object file: No such file or directory in Unknown on line 0
[Sat Apr 30 03:15:53 2011] [error] [client 66.249.67.242] PHP Warning: PHP Startup: Unable to load dynamic library './magickwand.so' - ./magickwand.so: cannot open shared object file: No such file or directory in Unknown on line 0

The Buddypress plugin directories present

bp-activity
bp-blogs
bp-core
bp-forums
bp-friends
bp-groups
bp-languages
bp-messages
bp-themes
bp-xprofile
Other plugins in use

Akismet
BP Group Calendar
BuddyPress Custom Posts
BuddyPress Like
BuddyPress Profile Music Widget
Buddypress Sidebar
Buddypress Sitewide activity widget
Chat
Cimy Rotating Header
CustomPress
Easy Albums - Buddypress users create and share images, video and audio albums - the easy way.
GD Star Rating
Login Image
Mail From
MarketPress
MP3-jPlayer
Signup TOS
Welcome Pack

I appreciate that it's the weekend and I am on London time so let me know if you can help when you can.

Steve