Thank you for contacting us and I'm sorry about the issue you are experiencing. Are you capitalizing the first letter or any characters in your search? We've recently found a bug that makes it so that only lowercase searches return results. We intend to release an update this week that will fix this issue.
Whenever I try searching in my records (by clicking the magnifying glass) I get zero matches regardless of the search string obviously matching strings in one or several records.
Using mSecure 5, version 220.127.116.115 on HTC One M9 running Android 7.0 (4.28.401.3)