When using the prediction function in read and write gold the predictions being mad are obscure or completely incorrect. also the title of the prediction window show double letter, for example you type “Predict” the title displays “PPrreeddiicctt”.
Another application that monitor keystrokes may be installed (this issue was originally reported when Global Autocorrect was installed and running).
Turn off the second keystroke monitoring application.
In this case simply exiting Global Autocorrect resolved the issue.