Yes, you can build such a report and a calculated measure to see days since the last issue the Client has reported.
You may construct a calculation like this. First, look for the date of the last created issues by going through all days in the Time dimension and picking the latest day with created issues. Then you may calculate days between the last found date for a customer and today.
The formula might look like this:
--date of the last reported issue
--go through days in Time dimension
--last day when issue is created for selected Client
)) > 0
--transform Time member to date for further calcaultions
More details on calculated measures and used function you can find there:
Zane / support@eazyBI.com