Hi @tovia schlesinger ,
Welcome to Microsoft Q&A!
What is your target framework? You can check it by right-clicking project > Properties > Application.
Please check if you put your resource file in bin folder of your project folder or not. if so, it will be deleted when re-building project.
In order for us to investigate it further, could you share us more reproduce steps or screenshots about the errors?
Sincerely,
Anna
*
If the answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.