Thanks for the report.

Can you attach the full build output for the project which errors with the below settings enabled:

• vMicro > Compiler > Verbose
• vMicro > Compiler > Show Build Properties

If you could also attach the same log from another ESP32 project which does not exhibit the issue it would help us greatly.

Thanks for the logs.

The differences I can see:

1) IDE Selection
The failing project is using the "Arduino 1.6/1.8x" IDE selection, but the working project is using the "Visual Micro (No IDE)" selection.   
-- Does it help the failing project if you change to the "Visual Micro (No IDE)" IDE Option?

2) Project Intellisense Version
The Working project seems to be using the old Intellisense system (no longer maintained), so the project in Solution Explorer does not show "(Arduino)" after its' name, and the new project will show this. The new system improves greatly on the old system so this feels unusual.

Neither of these should have an impact on the Intellisense however.

If you could provide some examples of the code lines which show errors (and if they are referring to a library for example) it would help us to investigate more quickly.

Thanks for the detail.

Can you attach the VCXPROJ file to the thread, or email it to us (support (at) visualmicro.com) with a link to this thread so we can investigate further?