Thanks John, I have updated to the latest driver but it is exactly the same. Provided I make adjustments BEFORE apreview completes running, I can use the sliders. However, if I wait to see what the preview looks like, then try to adjust any of the sliders, the plug-in crashes - every time. It has always been stable until now - and everything else works perfectly. Very frustrating, as TopazAI had become part of my regular workflow.
Please try to recreate this crash in Topaz Photo AI, then go to Help > Open Log Folder, send me all of the files within that folder. You should be able to attach them directly as a response to this email.
You can securely submit your files(s) to my Dropbox using the link below. Please be sure to send me a note to let me know you sent something.