Hello Richard,
Thank you for your question about your authorization. Yes, this can happen when you change your eBay password. We try to catch it before it happens, but we're only allowed to "poll" (check) this every so often.
You just need to go to Preferences and click the "Log in with eBay" button, and then you are all set.
If you still need assistance, please let me know, and we can take the next step.
bidslammer