Do you have nVidia? I had graphics artifacts on a computer with nVidia with Trisquel 7 but not 6. Upgrading your kernel may help (using jxself's repo).

About the other issues, i don't know, but I used to have weird issues occasionally and it turned out to be because my keyboard's home key was stuck. Whenever I was entering text, the cursor would go to the beginning, and web pages would scroll to the top.

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