So I made a plugin with custom C++ code following this tutorial. In the beginning he advises to compile the skeleton plugin to confirm there are no issues to begin with, so I did. Everything fine up to there.
Then I went on to creating my actual plugin. It uses some FFT's and complex math which is why I chose to do it in C++ as opposed to FAUST or other scripting tools available. I still wanted to use HISE over bare ProJucer as it gives very easy access to simple but effective interface design.
Now my plugin is done, and it works perfectly fine inside HISE. However, if I compile it and load it into a DAW (Reaper), it seems as if it is still the old export from before I started coding. I have one knob, which does absolutely nothing. My interface is there, just the C++ code doesn't seem to have compiled with my plugin for some reason, although it is listed in the section of things it will compile...
I thought the problem was that I was running HISE Debug from VS (as advised in the tutorial, to get access to breakpoints etc.), but saving and opening in a normal HISE instance worked fine, except again the export...
I would attach a snippet, but I have no clue what the minimum setup is to recreate this problem.

Is there anyone with any tips towards where the issue could be? Many thanks in advance!