I recently upgraded our site to Jomsocial 1.8.7 (from 1.6.x) and the Zap Calendar Front end throws an Http 500 error. If I turn the plugin off, Zap Calendar works fine.

I'm assuming this will get fixed in 2.0.11 but I just wanted to throw my hat in the ring to make sure it's on the radar

Thanks,
Bob

Here's my other versions...
PHP Built on: Linux www.603sports.com 2.6.18-194.8.1.el5.centos.plus #1 SMP Wed Jul 7 11:45:38 EDT 2010 x86_64
Database Version: 5.0.77
Database Collation: utf8_general_ci
PHP Version: 5.2.13
Web Server: Apache/2.2.3 (CentOS)
Web Server to PHP interface: apache2handler
Joomla! Version: Joomla! 1.5.20 Stable [ senu takaa ] 18-July-2010 18:00 GMT

I'm not aware of any problem. I am running 1.8.5 without any problems. I will look at 1.8.7 later this week. Check your Apache error log to see if there is any additional information there. You may also try turning off SEF temporarily to see if it is a SEF related issue.