Motion 5.2 hangs/freezes on project browser screen

Question

Downloaded FCPX 10.2, Compressor 4.2 and Motion 5.2 updates from App Store - FCPX and Compressor work fine but Motion 5.2 hangs on the Project Browser with the spinning beach ball of death. The Task Manager just reports "not responding".
I have trashed Motion prefs, trashed the app x 3, trashed the plist and re-downloaded x 3. Ran Disk Utility for permissions repair each time. Still no joy. Here's the header for the report:
Date/Time:  
2015-04-14 14:52:22 -0700
OS Version: 
10.10.3 (Build 14D131)
Architecture:
x86_64
Report Version:  21
Command:    
Motion
Path:       
/Applications/Motion.app/Contents/MacOS/Motion
Version:    
5.2 (262455)
Build Version:   1
Project Name:
Motion
Source Version:  26245005045000000
App Item ID:
434290957
App External ID: 812093572
Parent:     
launchd [1]
PID:        
722
Event:      
hang
Duration:   
1.00s (process was unresponsive for 287 seconds before sampling)
Steps:      
11 (100ms sampling interval)
Hardware model:  MacPro5,1
Active cpus:
16
Fan speed:  
799 rpm

Answer 1

I finally figured it out. After doing everything else I could think of tech-wise, plus Googling every combination I could, I tried logging in as a Guest -
ET VOILA! There must be some setting that I cannot see in my regular login as admin that cause the Motion 5.2 app to hang at the Browser/Project window and then go Tarantino-memory leak on me and grab all the system RAM.
By creating a new user account (after making sure everything worked as a guest), all apps are happy and working again!