In preliminary testing with the next OSX update, version 10.11 due later this month, we have found that the IDS Client (the PowerChurch Online connection software) is not compatible. We have reported the issue to the developers of the IDS Client, who are expecting a compatibility fix during the last quarter of 2015.
It is not recommended you upgrade to OSX El Capitan on computers where you will need to access PowerChurch Online during the next few months.
EDIT:
An update to the IDS Client has been issued for Mac users that resolved this issue.
PowerChurch Online - OSX El Capitan Compatibility [RESOLVED]
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