You can already post your logs now, it will have information from your crashes or errors somewhere in there which could be useful.
Are you using Sencyl 4.0.2, or an older build? Importing resources will only cause issues if you import a behavior that uses custom blocks from other behaviors, or if you import a behavior with the same name as one already in your game. Aside form that, importing resources should work.
As for your error with lists, when that happens it might be a good idea to Clean Project. If that fails, sometimes using print blocks in your code could "force" Stencyl to update your behaviors. That has happened to me before, but again I don't know what triggers it. And remember that hidden lists/maps must be initialized with the "create new list" and "create new map" blocks.