Internal server error 500 when saving edited event

PHP Version : 5.6.17

MySQL Version : 5.6.16-log

Server Information : Windows NT WL46 6.1 build 7601 (Windows Server 2008 R2 Standard Edition Service Pack 1) i586

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : Yes

Max Input Vars ? : 10000

Club code set? : No  

User Agent : Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:47.0) Gecko/20100101 Firefox/47.0  

Joomla : 3.6.2

component_com_jevents : 3.4.17

module_mod_jevents_cal : 3.4.17

module_mod_jevents_custom : 3.4.17

module_mod_jevents_filter : 3.4.17

module_mod_jevents_latest : 3.4.17

module_mod_jevents_legend : 3.4.17

module_mod_jevents_switchview : 3.4.17

plugin_content_jevents : 3.4.17

plugin_finder_jevents : 3.4.17

plugin_search_eventsearch : 3.4.17

plugin_system_gwejson : 3.4.17

PHP5.6

Since updating Aug. 18th from Joomla 3.5.1 to 3.6.2
and JEvents 3.4.12 to 3.4.17 I cannot anymore save any event. Instead I get an internal servor error 500 by Helicon Ape. See attached screen shot.
Non jevents items all save and upload normally.