There is a known issue with Connections 5 CR4 and all versions of Connections 5.5 when using Chrome version 60.
It affects events not being displayed and errors relating to events in the UI. It has also been reported that comments can be affected also.
After multiple BP’s and Customers reported this IBM Support have come up with a fix very quickly.
The fix you need is IFLO92844 – currently it is only available from IBM support – not sure how long it will be until it is available on fix central.
Open a PMR with IBM and reference these 3 PMR numbers: 76364,082,000 – 76379,082,000 – 38309,756,000 and ask for IFLO92844. You will need to specify the Connections version and CR.
The fix updates the Common app and takes about 10 mins to deploy.
Thank you IBM Connections Support / Dev for resolving this so quickly