I registered on your site and tried to adopt a pet, it never went through so I am assuming the entire adoptable adoption process is blocked on your site. This is not a glitch for Mys v1.2.3 though, as I am able to successfully adopt any pets as I want from demo site, nor is anyone bringing up this problem the first week after I released Mys v1.2.3. I am assuming you have edited something on your own, please do lemme know what changes you've made to your site.
Also when did you download Mys v1.2.3 btw? I reuploaded the file with bug-fixes and no one has ever downloaded it since then. Id recommend you to download the file again and upload to your site to replace the old files:
http://www.megaupload.com/?d=KR3U1YXO