Lightroom CC crashes on launch on OSX 10.10.3

Question

Running on 15" Retina MBP Late 2013.
Tried reinstalling, logging in and out from Creative Cloud, as well as removing preferences file, uninstalling Lightroom 5 and moving LR5 catalogue out of the way.
Crash happens after upgrade/create new catalogue prompt.
amt3.log shows the following (parsed for "ERROR"):
04/21/15 20:46:40:901 | [ERROR] |  |  |  | ASUFeatureParser |  |  | 1767187 | Signature successfully validated for asu features
04/21/15 20:46:40:921 | [ERROR] |  |  |  | SLCoreService |  |  | 1767187 | No value for key [Extended_License_Type] in user dictionary.
04/21/15 20:46:40:921 | [ERROR] |  |  |  | SLCoreService |  |  | 1767187 | No value for key [EXCEPTION_TYPE] in user dictionary.

Answer 1

Isolated log from the crash (after creating new catalogue this is the output in amt3.log):
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | Looking for alternate serial if any.
04/21/15 21:45:10:572 | [DEBUG] |  |  |  | PCDService |  |  | 18231 | No value for key [SN] in hive [V7{}PhotoshopLRCC-1.0-Mac-GM{|}en_US] in cache : 519
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | Found Serial = [REDACTED]
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | AMTPlugPlug : Get Licensing information
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | Looking for alternate serial if any.
04/21/15 21:45:10:572 | [DEBUG] |  |  |  | PCDService |  |  | 18231 | No value for key [SN] in hive [V7{}PhotoshopLRCC-1.0-Mac-GM{|}en_US] in cache : 519
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | Found Serial = [REDACTED]
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | PlugPlug : AdobeId has been created or SN with no SaaS bit
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | PlugPlug : Can Go Online returned as true
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | AMTPlugPlug : Getting the AdobeID / Timestamp Map
04/21/15 21:45:10:572 | [INFO] |  |  |  | AMT |  |  | 18231 | AMTPlugPlug : Preparing response for getProductLicenseInfo
04/21/15 21:45:10:573 | [INFO] |  |  |  | performance |  |  | 18231 | AMTPlugPlugRequest took 1.177000 ms
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | Looking for alternate serial if any.
04/21/15 21:45:10:573 | [DEBUG] |  |  |  | PCDService |  |  | 18231 | No value for key [SN] in hive [V7{}PhotoshopLRCC-1.0-Mac-GM{|}en_US] in cache : 519
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | Found Serial = [REDACTED]
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | AMTPlugPlug : Get Licensing information
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | Looking for alternate serial if any.
04/21/15 21:45:10:573 | [DEBUG] |  |  |  | PCDService |  |  | 18231 | No value for key [SN] in hive [V7{}PhotoshopLRCC-1.0-Mac-GM{|}en_US] in cache : 519
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | Found Serial = [REDACTED]
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | PlugPlug : AdobeId has been created or SN with no SaaS bit
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | PlugPlug : Can Go Online returned as true
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | AMTPlugPlug : Getting the AdobeID / Timestamp Map
04/21/15 21:45:10:573 | [INFO] |  |  |  | AMT |  |  | 18231 | AMTPlugPlug : Preparing response for getProductLicenseInfo
04/21/15 21:45:10:573 | [INFO] |  |  |  | performance |  |  | 18231 | AMTPlugPlugRequest took 0.156000 ms