Hi Teleski.
I believe I have a fix for you on this issue. It seems the custom dictionary file permissions where not set correctly on upgrade and the spell check could not access the file correctly. This prevented not only you from adding words, but also checking them during check. I am going to email you instructions on how to set the permissions in the file. If you do not feel comfortable with this, you can always reply to my email and I can set up a time to do this.
Sorry for the inconvenience this caused you and thank you for reporting it. We will be able to bug this issue and work on getting it resolved.
