I am unable to make selections from drop-down lists, as whenever I click on the block the drop-down list flickers briefly but does not remain visible which makes it difficult to choose options and the only way to do so is a combination of clicking the box and using the down/up arrow keys. Right clicking also has this issue on occasion, though mostly it often takes a few attempts to make the list visible and the page needs to be refreshed every 5 or so clicks to make the menu visible rather than just briefly flickering into view. I tried switching to Chrome as the issue still persists, so perhaps it may be an underlying issues with my computer as opposed to my internet browser.