All of a sudden today Filemaker Pro 12.0.5 won't launch. I click on the application and it bounces once in the dock and then it quits itself an error message pops up that says "Filemaker Pro quit unexpectedly". It then shows a report that can be sent to Apple.
The weird thing is I last launched FileMaker about 2 days ago and it worked perfectly fine. I have not installed any OS updates or Filemaker updates since then. (nothing has changed). I was using the trial version of Filemaker 14 today but I have been able to open version 12 after I installed the trial of 14 and have used them interchangeably. (and no its not a problem of trying opening a new fmp.14 file in version 12.)
I've tried the normal rebooting the computer, etc and nothing has worked. I'm running Mac OS X 10.11.3.
Here's part of the error message I get:
Process: FileMaker Pro 
Path: /Applications/FileMaker Pro 12/FileMaker Pro.app/Contents/MacOS/FileMaker Pro
Version: 12.0.5 (12.0.5)
Code Type: X86 (Native)
Parent Process: ??? 
Responsible: FileMaker Pro 
User ID: 501
Date/Time: 2016-03-18 16:33:10.928 -0400
OS Version: Mac OS X 10.11.3 (15D21)
Report Version: 11
Time Awake Since Boot: 610 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Application Specific Information:
*** Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <FMInspectorWindowController 0x10608a40> for the key path "areInspectorsVisible" from <FMInspectorManager 0xd5f81b0> because it is not registered as an observer.'
Any ideas what might be causing this issue?