I have the same issue with SEGGER Embedded Studio for ARM 5.10, it started happening after the update to SEGGER Embedded Studio for ARM 4.52c and the update to 5.10 did not fix the issue. SEGGER seems to be unable to resolve any other files other than main.c. I performed the steps above about rebuilding project (&solution) but it did not help. The source files have not moved and the paths match -> this is also true for my project. I am using relative paths throughout the project (as it is shared…