PHPJunkyard support forum

I did a lookup of your website IP and if your hosting company is "deziweb" then yes, this indeed goes for your hosting company and feel free to show them my responses.

I have got an answer from my hosting company. They said that the antivirus and malware scripts/scanners that are on the server, keep seeing GBook as dangerous. They use ClamAV as a scanner. They don't look at the scripts themselves.
They also said that if you could update GBook in a way that ClamAV doesn't block GBook anymore, my problem will be solved.
They don't want to 'white listen' a script that their scanner blocks......
Remember, I'm not an expert, I'm just the mesenger now!

It probablt is the encoded part of the script that handles the license and the spamfilter that triggers the anti virus program. I am not sure if Klemenc can change that.

They should give you that reason from the start then, not a lame excuse

Some anti-virus scanners indeed detect gbook as a "potential threat", because some part of files are encoded. Even though anyone with some basic PHP skills can decode that and confirm nothing dangerous is there, anti-virus scanners are not that smart unfortunately.

You can give this file I posted some time ago a try and see if it stays under the radar:
http://www.phpjunkyard.com/extras/gbook17_evalfix.zip

I have waited a while to post an answer, because I really wanted to be sure....
After that last answer from my hostcompany, the guestbook no longer disappears! Someone must have made ​​an adjustment after all!!! So I didn't have to use that file (yet), that you posted, Klemen. I hope it will not be necessary and that it's solved now
Thanks very much for your help!!!