Hello! I'm a new user, just wanted to register to say thanks for all the work put into this app and to help out with development! This is one of the most valuable utilities for the Nspire. I hope to help find and fix any bugs I am on 3.9 with ndless.

I have noticed some minor speed issues and random slowdowns after excessive page browsing, zooming, and opening of different PDFs. I assume these are exceptions caused by running out of memory? After using it for a while, I got scared when I tried to open a PDF again, and the calc couldn't recognize it. It no longer recognized any .tns file, actually... even though ndless was still installed  . A reset and reinstallation of ndless fixed it, however.

Also, nPDF did cause a crash that uninstalled ndless. I'm sure all of these issues could be addressed in the future. There are occasional force closes of PDFs, but they simply need to be reopened. Sometimes the "go-to page" dialog doesn't appear but it still takes input. You have to be very slow and cautious with nPDF, and wait for it to work, or risk having a crash/error. Treat it with respect and it will respect you.

That's all I have for now  I submitted a pull request on the GitHub to fix a very minor error with the numpad scrolling.