Hi Erin0,
Is Caffeine installed on your system?
If so, it may be causing the interference you're seeing in SecureCRT. Here is a link and some additional info provided by the authors of that program:
https://www.zhornsoftware.co.uk/caffeine/
Compatibility Caffeine works by simulating an F15 key up event every 59 seconds. Of all the key presses available, F15 is probably the least intrusive, and least likely to interfere with your work.
However, Caffeine might interfere with some apps: •PowerPoint uses the F15 keypress to pause video in a slide
•Google Docs/Sheets
•Terminal emulation, e.g. Putty
If you think any of these might cause you a problem, set the -useshift command line parameter.