Re: core.xxxxx main directory files
I'm only ))Quasi-Techno-Super-Erudite((, but maybe I can help. 😉
The core.xxxxx files can be deleted. They're Apache core dumps and aren't needed for Tiki operation. The php files you might or might not need, but they are quite small so I'd recommend keeping them.
BTW, the columns on your Tiki page are overlapping a bit, a problem with the old classicblue style, which is also missing a few background images. If you want to look into a site makeover, come to themes.tw.o
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-- Gary