We have a few members of the development team that have both products installed and we aren't seeing any compatibility issues between the two, so I suspect the cause of this may be elsewhere.
Typically, the most common cause of our EFBs freezing is a conflict with some other mod in the Community folder (like the Horizon Sim 787. or Heavy Division 787 mods). So the first steps to check if this is the case would be to rename your Community folder to something like "Community.old" and then create a new Community folder named "Community" and install the 146 into it. If you then load the simulator with only the 146 installed and the EFB works, then there must be a conflict with one of the mods in the "Community.old" folder.
If the issue continues to persist, or if you would like any further assistance troubleshooting this, please do get in touch Just Flight support via the following link, and our support team will be able to assist: https://www.justflight.com/support
Mark - Just Flight