I have updated Comicpress twice and both times my comics have disappeared on my page. This is very alarming for a webcomic creator. I understand this is pretty normal.
The fix is fairly easy - if you can find it. Since I don't update every time an update comes out, if would be great if this page addressed it. Gave people some sort of caution about updating.
"Once you update, go into Comicpress Manager and reset your comic category settings"... that sort of thing. I imagine some less savvy people give up or seriously panic. I know I did the first time it happened to me.
Other than that, tho, this theme is a lifesaver.