Please restore the app to factory defaults. Here is how:
1. Quit the app if it is running.
2. Hold the Option key and use the “Go” menu in the Finder to Show Library.
3. Delete these files if they are present:
4. Delete this folder if it is present:
/Users/<you>/Library/Application Support/Apimac/Timer/5. Launch the app in order to recreate from scratch the resources it needs.
We released a new version of Timer, you can find info about the upgrade by visiting this solution page.