There's a difference to updating as soon as the update is released and after it has been analyzed, we know what came with it (I posted it on the first page of this thread) so since we know nothing important changed, it's perfectly fine to update now. The "wait" is ALWAYS until we can determine whether it will break compatibility or not, that's all, it's never "don't update ever"...
The update by itself could NOT have caused your problem, it's something else you did. There's no known software issue that could make the touchscreen touch itself, it's always either the screen frame (most often), VERY bad calibration (try to fix it in the settings) or the screen itself is bad and needs replacing (eg: after the system took a fall or hit). Everyone who updated had no issues, so it's not the update, it's something you did and it just happened to coincide with when you updated. Only other explanation would be if the update didn't install correctly or something, so try recovery mode, but this is a very long shot compared to the other solutions I listed.