Fatal error after upgrade to 1.5.6

[mvdb49]

Hello,

I upgraded my Coppermine 1.4.8 site to 1.5.6.
No problems during upgrade, Check versions only has a remark about anycontent.php (which is logical).
Anyway, when I click on a thumbnail to open the intermediate picture, I get this on a black page:

Fatal error: Call to undefined function ctype_alpha() in SYS:/apache2/htdocs/cpg/include/inspekt.php  on line 485

I am running PHP 5.2.6 on Netware.
URL: www.Mandm.nl

I put a checkmark at "Go directly from thumbnail to full-sized image", which works like a charm. No error message.
But I would like to be able to use my intermediate pics.
It is a clean install, no plugin's are active.
I am using the 1.5.x theme from Timo.

A search ctype gave 0 results.

So, if anyone can help me, please

Thank you, Martin

[Αndré]

ctype_alpha is a PHP function: http://www.php.net/manual/en/function.ctype-alpha.php

Maybe it's disabled on your webhost?

[mvdb49]

Andre,

Sometimes I wonder where my brain is.
You were absolutely right.
Problem solved by turning ctype on.

Thanks, Martin