I think there is a problem with the case of some filenames.

Freichat v 6.1 was installed a few days ago and nearly everything was fine.
To upgrade to 6.1.1 I renamed freichat to freichat-6.1 and uploaded the new files.
During the installation an error occures. The file "Joomla.php" could not be found (btw. I chose JCB as driver).

After inserting a symbolic link in the driver directory pointing to joomla.php the installation succeded, but on my website (J1.5.22 with CB 1.4) no freichat window appeared.

Perhaps I just have to insert a link pointing to jcb.php, but I think there may be more problems with cases of some filenames

When you are installing and running FreiChatX the name of the folder should be
strictly "freichat".
, However you can change that but it will require some
changes in a file (modules/mod_freichatx/mod_freichatx.php)

Yes, the installation folder of freichat version 6.1.1 is "freichat" ... I renamed the folder containig version 6.1 to "freichat-6.1" to have a backup ;)