We had no report of a similar issue on that version, so the case should be investigated in the details.
However, to do this, you should upgrade further to the latest version of the library.
You can see in the changelog that you can expect very few compatibility issues.
However, this requires Server version 7.0 at least. If you are using Server version 6.1, note that it is no longer supported as well.
Is it possible for you to follow this path?