DTTG annotation glitches

I have recently started having some trouble with the DTTG annotations feature. When I create an annotation on a PNG file through the ‘info’–>‘annotations’ pathway and start to type in the annotation document, it automatically erases my text after a few seconds and creates a file that seems locked. I have to exit and enter the annotation again, after which I am able to enter text. Not a terrible problem, just annoying. Any thoughts on what I might be doing wrong or whether there is a bug? Happy to share screenshots. Thank you!

Yes, screen captures or a screencast would be helpful.