Softphone Call Control changing to Softphone after upgrade?

[accentlogic]

After my upgrade to v15 I thought my personal 3CX Client preference for Call Control was changed from IP Phone (CTI) to Softphone. Now one of my clients has upgraded to v15 and is reporting that all 100+ extensions have changed from IP Phone to Softphone. The admin is manually changing them back now.

Has anyone else seen this, or is this a known issue - and maybe corrected in the SP2 upgrade from v14?