This is fixed in MacDraw Pro 1.5v1
There is a confirmed issue in MacDraw Pro 1.0v1 where it may crash when you click on a group. The critical factor is the number of objects in the group. This number of objects is not a fixed number , but varies depending on other factors. Fortunately, it only happens when the Hide Notes command is selected, which is not the default setting. Here are the workarounds:
1) Select Show Notes. With Notes showing the issue will not happen. If you want to hide notes, do step #2, then select the Hide Notes command.
2) Ungroup the group. Either leave it ungrouped or change the number of objects in the group. For example, adding a transparent object to the group is acceptable.