Fatal error: Class 'ChronoFormsAdmin' not found

I have this error with Joomla 2.5.1 Chronoforms_V4_RC3.2_J1.6 (PHP 5.2.17)

Fatal error: Class 'ChronoFormsAdmin' not found in /var/www/vhosts/MyDomains.ltd/subdomains/test/httpdocs/administrator/components/com_chronoforms/admin.chronoforms.php on line 88

file php.ini (suPHP)

session.save_path=/var/www/vhosts/MyDomains.ltd/subdomains/test/httpdocs/session
upload_tmp_dir=/var/www/vhosts/MyDomains.ltd/subdomains/test/httpdocs/tmp
display_errors=on
upload_max_filesize=8M
output_buffering=off
memory_limit=64M
max_execution_time=360
magic_quotes_gpc=off

the error is in these sections
Forms Manager
Form Wizard
Easy Form Wizard
Apply Updates

No error:
Validate Installation

Hi INVY,

A few users are reporting this - you are the fourth I think. Most users don't see this error which makes it hard to diagnose.

Please will you send a link to this post to Max using the Contact Us link above. He may want to look at your site to work out exactly what is happening here.

Bob

sent a private message with links and user and password

News?

Hi INVY,

No news here. I don't have a fixed version so can't help.

I do think this is a problem limited to PHP 5.2

Bob