I just went from the older add-in to the new extension. I have both 2013 and 2015 installed. I have two [source code] identical (other than names) projects (one in 2013, other 2015). The 2013 version now throws compile errors that don't even make sense to me. The project compiled and ran just fine immediately before the upgrade. I tried to attach a zip of the entire project but it was too big. The 2015 version still builds just fine. Example of errors:

MsgPumpTest.ino:8:25: error: variable or field 'setFactoryDefaults' declared void
:void setFactoryDefaults(TComponent* the_component)
MsgPumpTest.ino:8:25: error: 'TComponent' was not declared in this scope
MsgPumpTest.ino:8:37: error: 'the_component' was not declared in this scope
:void setFactoryDefaults(TComponent* the_component)

I Have two add-ins installed, Atomineer Pro and QT. They have been installed for a long time, and I don't see how they have anything to do with this.

double clicking the error takes me to the top line of the ino file, not to the error (which actually is NOT an error anyway, it's perfectly valid code). Also, the properties window looks to be missing a bunch of stuff, like the project defines.

Okay, never mind the properties thing. I did not realize that you get a different property page if the solution is highlighted in solution explorer instead of the project.

Is there some way to upload (or email) the entire project to you guys? I cannot get the original project to build even in 2015 - same errors. The source is IDENTICAL in both projects. Also, what is all the junk in appdata/local/V.Micro? And why do I also have a VMicro folder in the same place?

Thanks for the files.

Have you always set default values on your prototypes in the .ino? 

The way things have always worked for Arduino is to auto generate prototypes which will clash.

You can switch this feature off in project properties Micro "general>auto generate prototypes"

You can also remove the "Visual Micro" sub folder from below your sketch folder.

Switch to "Release" mode until the issue is resolved.

If you switch off auto generate prototypes then you simply need to add prototypes for each method in the .ino source files. It's doesn't break anything if you do that because that is all the switch controls.

I expect you had this switch off for the current project prior to upgrade and visual micro lost the setting during upgrade.

You can either switch auto prototype gen off or move your code that requires default values in the prototypes to cpp/h files