Hi gap, Vm3.0.18 break some code, it's why i don't published the plugin for now.
I don't want loose time each new VM release, so i only publish it when Vm dev stop to change behavior on each release.
I have to choose, remove the auto price calculator or add all new code for prices in case you use VM3.0.17+.
If i remove price calculation from selected products, my plugin is working.
Note: this problem is not only in my plugin, and some other plugin using same method have the same problem, due to internal vm price calculation, when you try to change it after