After reading a number of posts indicating that the Perian plug can interfere with some things and being advised to NOT install it after updating, I wanted to do exactly that when updating to ATVflash 4.1.3.
Funny thing is, that on the two updates of 4.1.3 I did, Perian came up already installed. The first time, I thought it was my mistake, having been a bit impatient with the ATV menu response after doing a factory reset, running the patchstick (v4.1.2), updating to 4.1.3 from the Maintenance menu, running Nito Smartinstaller, and clicking the remote twice on the Maintenance menu after a reboot to config plugs/extras (Perian is the first option, so I thought I’d accidentally enabled it). The second time around I was more careful. I did the entire Factory reset/ATV 3.0.2 update/ATVflash install and update to 4.1.3/Smartinstaller sequence again. Much to my surprise I found Perian AGAIN already enabled without me having done anything with plugs and extras. So I disabled Perian, and have been using ATV as such since then. XBMC works great, but Nito is having network problems (as indicated in another thread I posted here). I don’t know if that problem could be related to Perian (I doubt it, since Perian doesn’t appear to have anything to do with networking), but I mention it for purposes of full disclosure
Under ATVflash 4.1.2, Perian needed to be manually enabled, under 4.1.3 it seems Perian is automagically enabled. Can anyone confirm this?