No default option for 'Replace text'

Hello,  my 'Replace text' tool in Reader DC has changed to be red strikethrough but with blue insertion point (a red question mark is shown in the 'Color' box). I want it to be blue strikethrough and blue insertion point, to differentiate from strikethrough (which is red). On right clicking, there is no 'Make properties default' option, just 'Locked' option. Other editing dialogue boxes do have this 'Make properties default' option. I assume this is as a result of an update as this has only happened over the last week. Can anyone help? or is this a bug in the latest Reader that needs sorting?

Thanks