New iPhoto crashes on launch.

Question

Yesterday, I completed an "update" on OS-Yosemite that puts me at ver. 10.10.3. With it came the "new look" iPhoto, which seemed to work long enough to synch with my iCloud photo library.
This morning (day 2) it now crashes on launch. The first launch gives me a few seconds of pinwheeling followed by a crash, and subsequent launches just crash almost immediately.
I've tried re-booting, and I've tried re-building the iPhoto library (older trick). So, all these tricks don't work. The top-level string on the error message, I will now copy into this message:
Code Type:        
X86-64 (Native)
Parent Process:   
??? [1]
Responsible:      
Photos [507]
User ID:          
502
Date/Time:        
2015-04-16 11:02:20.231 -0500
OS Version:       
Mac OS X 10.10.3 (14D131)
Report Version:   
11
Anonymous UUID:   
2A9AB5C0-6381-7512-5788-87F131388ED6
Time Awake Since Boot: 380 seconds
Crashed Thread:   
0  Dispatch queue: com.apple.main-thread
Exception Type:   
EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes:  
0x0000000000000001, 0x0000000000000000
Application Specific Information:
Photo Foundation logging:
2015-04-16 11:02:18.750: Unable to replay changes using persisted marker. Falling back to replaying all. (__48-[RKFaceChangesHandler startListeningForChanges]_block_invoke:118)
2015-04-16 11:02:18.799: Received changes notification alert: <LiModelChangeGroup: 0x618000863400>  alert flags : Replay Complete (__59-[RKFaceChangesHandler startListeningForChangesFromMarker:]_block_invoke_2:173)
Crashing on exception: *** -[NSConcreteTextStorage attributesAtIndex:longestEffectiveRange:inRange:]: Range or index out of bounds
Suggestions? Comments? Commentary?

Answer 1

A brief clarification: I'm referring to the new and "improved" version of Apple OS Photo file management, AKA "Photos."
Regardless it still crashes on launch.