crash in FotoMagico 5.0b44

I openen a new slide show, inserted snippet mountain to test the down size error -> worked fine. Then 2 pics inserted, second was a copy of first to play with frames -> crash

Process: FotoMagico 5 [9697]
Path: /Applications/FotoMagico 5
Identifier: com.boinx.FotoMagico5
Version: 5.0b44 (21639)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: FotoMagico 5 [9697]
User ID: 501

Date/Time: 2015-12-10 12:22:17.520 +0100
OS Version: Mac OS X 10.11.1 (15B42)
Report Version: 11
Anonymous UUID: D49F1CB2-78C9-9A49-0250-D7C64AF18E5A

Sleep/Wake UUID: 7E0D54B6-54DE-47BB-9F42-B5C12725AA71

Time Awake Since Boot: 140000 seconds
Time Since Wake: 7800 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue:

Exception Codes: KERN_INVALID_ADDRESS at 0x000007feb0efca48

VM Regions Near 0x7feb0efca48:
MALLOC_LARGE_REUSABLE 0000000128fd9000-00000001298a8000 [ 9020K] rw-/rwx SM=PRV
STACK GUARD 0000700000000000-0000700000001000 [ 4K] —/rwx SM=NUL stack guard for thread 9

Application Specific Information:
objc_msgSend() selector name: removeObserver:forKeyPath:

compete dump sent to