Fatal Errors on Install

I've been trying to install (1.3.14) on a shared host (hostmonster), but
have been running into problems. I had everything set to 0755 but got a 500
error until I changed the permission on the index.php to 644 and then things
started to work. That doesn't make sense to me, but it was the only way to
get by the 500 page.
I've been able to access the database and the wiki but when I try to login I
get

*Fatal error*: Non-static method _PearDbPassUser::_PearDbPassUser() cannot
be called statically, assuming $this from incompatible context in *
/home1/..../wiki/lib/WikiUserNew.php* on line *1118*

Clearly this is indicative of a deeper problem in my installation, but what?

You can see the behavior at http://physandmath.org/wiki

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