Easy Calc always incorrect

I'm using Joomla 1.5.22, Kunena 1.6.1, rhuk_milkyway template, Firefox 3.6.11 and IE 8. Also using latest ECC+ version 1.5-13

Apologies for not speaking German.

Firstly, fantastic product. Far superior to all the other Captcha and anti spam programs. No hacks or php manipulation which is the way it should be.

I'm having trouble with the Calc though. I've activated it for Kunena (Guest Post). Everything appears to be running fine and the calc appears. E.g. 10 minus 4 equals.

However, when I enter the correct answer I always receive an error message stating that the answer was incorrect (or something similar).
I followed the other topic 'Captcha always wrong' and tried to use the attached replacement php file but then the Easy calc function disappears.

Any help would be appreciated.

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