create database dialog, select device, tab, tab to the Size Type field, type 'm':

java.lang.ClassCastException: java.lang.String cannot be cast to com.aquafold.datastudio.visualedit.components.SizeFormat
    at com.aquafold.datastudio.visualedit.schema.models.StorageModel.setValueAt(StorageModel.java:205)
    at com.common.ui.table.WrapMultiTableModel.setValueAt(WrapMultiTableModel.java:69)
    at com.jidesoft.grid.TableModelWrapperImpl.setValueAt(Unknown Source)
    at com.jidesoft.grid.DefaultTableModelWrapper.setValueAt(Unknown Source)