I have an issue when re-opening a QGIS project. I saved and closed it before shutting down the computer. The day after QGIS is whining about missing layers, but the path is correct and there is nothing wrong with the layer. I can import the "missing" layers separately without any issues.
First image shows where QGIS is not able to find the layer. Second image shows the actual location of the layer, which, as you can see, is the very same that QGIS cannot find it.
I've tried most start-up repair tools, but nothing seems to work.