Erratic "find" behavior (or not behavior at all)

Hello, I had never have problems with Igor 6, across any of its versions. Now I have a brand new windows computer, and sometimes I can't even copy text (I can'tt remember the erro message but was about and OS problem) from procedure files.

 

However, after a few tries I can, and my issue here is about find/replacing text. Also sometimes I get the following message, which has no sense for me. In the past I had replaced some text selecting tons of texts. The error with find/replace says:

"the search string contains a carriage return and this program can't do a find across paragraph boundaries"