Try the default template, that will tell you right off the bat if the problem your having has to do with the template.
Otherwise, I think there is something corrupted and would download a new copy of WP. The installation isn't very difficult, just setup a new database in case it's gotten corrupted, copy the database settings into the WP-config file and your pretty much done.
I have had problems with a host and the access to databases with a different script that had similar type of problems as you are describing so I wouldn't discount a hosting issue either.
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