I use BBClone on my weblog but I haven't updated yet (I will hopefully do it tomorrow or in the wekend).
But some tips that I can give you are:
- Use absolute Paths (not relative)
- Make a flush of the outputh of php before calling BBClone (this will make your site a little faster for the user)
If still doesn't work, change your setting of PHP to show all errors and maybe you can see what the problem is. (Actually you could do this before... if you don't have access to php.ini try turning the messages on using the php function).
Sorry for not mentioning the exact name of each php function (I don't remember their name) but with a search at php.net you should be able to find them.
PS. I know this is all technical stuff but I assumed that if you are trying to add a counter such as bbclone you understand a little about php.