Starting again by reinstalling Cakewalk Bandlab worked for me. Thanks to each of you for the help. Here is what I got from Cakewalk Support, quite quickly, too!
To completely remove Cakewalk by BandLab from your computer and reinstall it, follow the steps below.
Please note that this will remove any effects presets and key bindings you may have made in Cakewalk by BandLab. You can back these up separately if you like, using Utilities menu > Cakewalk Plug-in Manager, Edit > Preferences > Customization – Keyboard Shortcuts and Edit > Preferences > Customization – Colors.
1) Uninstall Cakewalk by BandLab. This is normally done within the BandLab Assistant app. Go to BandLab Assistant > Apps > Cakewalk by BandLab, click on the arrow on the right side of the tab and select Uninstall. This will not remove any of your plug-ins, project files or audio data.
2) After the uninstallation completes, open the Run Prompt. In Windows 7, 8, and 10, open the Run Prompt by holding down the “Windows” key and pressing “R” on the keyboard.
3) At the Prompt, type regedit and click [OK].
4) Click [Yes] if asked to allow the program to make changes to your computer.
Important: When you access the Registry Editor, create a backup by going to File > Export. In the Export Registry File window that comes up, make sure “Export range” is set to “All” and that “Save as type” is set to “Registration Files (*.reg)”. It is very important to create a backup of your registry because if you accidentally delete a registry key there is no undo function. You can, however, double-click on the Registry backup you made above to re-import your registry keys if you make any mistakes. You must re-import your backup (if needed) before restarting your computer.
5) Delete the following Registry keys: If you do not have one of the Registry keys below, simply proceed to the next one on the list.
HKEY_CURRENT_USER\Software\Cakewalk Music Software\Cakewalk\ Core
HKEY_LOCAL_MACHINE\Software\Cakewalk Music Software\Cakewalk\ Core HKEY_LOCAL_MACHINE\Software\Wow6432Node\Cakewalk Music Software\Cakewalk\ Core
6) Open the Run Prompt again.
7) Copy and paste %appdata%\Cakewalk into the prompt and click [OK]. On Windows 7, 8, and 10, the “AppData\Roaming\Cakewalk” folder will open. 😎 Right-click on the Cakewalk Core folder and choose “Delete.”
9) Delete the contents of the following directory: C:\Program Files\Cakewalk\Cakewalk Core
10) At this point, you can reinstall Cakewalk by BandLab from BandLab Assistant. Be sure to use the latest version of BandLab Assistant by clicking the gear at the top left and choose Check for Updates, then go to Apps > Cakewalk by BandLab, and click [Install].