Asset Manager Empty

Hi, I’m new here but used the app for a few weeks on El Capitan without any problems. Now my system is Mojave, clean install and have problems with Blocsapp: the asset manager is empty, the right side of the program is also empty, I can’t work because can’t change any option. Any suggestion? Thanks and sorry my english.

I have checked that it happens also in High Sierra, with full program and demo. In El Capitán runs perfect, so what may be the problem?