I was testing new registration on tigase.org with captcha and I had lots of problems with going through the whole process. It worked eventually but not without problems.

There were problems with getting registration form in the first place. I managed to get to the registration form after a few attempts. Usually the client just hangs waiting for the response from the server.

When the form was displayed, and I filled it out but provided incorrect captcha response the client displayed an error. Then, I entered a correct answer to the captcha and after pressing enter, the client again hang on the form sending/receiving response from the server.

Only after reseting the client, loading registration form (after a few unsuccessful attempts) and filling all the fields correctly the first time, registration process was all successful.

It looks to me, like, sometimes the client has problems with connectivity with the server. Maybe it is because of clustered tigase installation or maybe it is something else. I did not noticed similar problems with our web client or Android client so it seems like this might be client side problem.